Most cordless string trimmer lists are written for a half-acre suburban lot. They fill up with 10-inch, 18V units that bog down the moment the grass passes ankle height, and they never once tell you how many batteries a real session on acreage actually takes. That is the gap this roundup closes.
On one to three acres you are not trimming a lawn, you are clearing a volume of vegetation. Cutting swath, total battery capacity and the number of spare packs in your bag decide whether the job takes 45 minutes or a full Saturday. Peak brand power matters far less than those three numbers. We compared ten cordless string trimmers built for that workload, checked every spec against retailer listings, and leaned on what owners report after a season of real acreage work.
Every pick below is genuinely cordless and genuinely sized for large property work. Corded units and no-name “compatible with DeWalt battery” private-label trimmers are excluded, because both cost you time you do not have on a Saturday morning.
Table of Contents
Top 3 Cordless String Trimmers for Large Yards (October 2026)
BLACK+DECKER 40V MAX LST140C
- 6.4 lb light weight
- 13 inch swath
- PowerDrive transmission
- AFS auto feed
10 Best Cordless String Trimmers for Large Yards (October 2026)
Every trimmer in the table below is cordless, carries a 13-inch or wider cutting head, and is sold by a brand with a real battery ecosystem. The full specs, pros and cons sit in the individual reviews.
| Product | Specifications | Action |
|---|---|---|
| BLACK+DECKER 40V MAX LST136 |
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| BLACK+DECKER 40V MAX LST140C |
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 EGO POWER+ ST1623T |
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 Greenworks 80V 16 Inch Trimmer |
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 DEWALT 60V DCST972X1 |
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 Kobalt 80V Max Baretool |
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 WORX WG183 40V |
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 RYOBI 40V HP Attachment Capable |
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Check Latest Price |
 EGO POWER+ ST1511T |
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Check Latest Price |
 Milwaukee M18 2828-20 |
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Check Latest Price |
1. BLACK+DECKER 40V MAX LST136 – The Best All-Rounder for Acreage Work
BLACK+DECKER 40V MAX 13 in String Trimmer Edger Cordless with Adjustable Telescoping Pole, 2 in 1 Weed Wacker Lawn Edger, Includes Battery and Charger (LST136)
40V MAX lithium platform
13 inch cutting swath
7.8 lb
8500 rpm
3 year warranty
Pros
- Automatic Feed Spool needs no bumping
- Trims and edges in seconds
- Light 7.8 lb body
- Charge indicator on the battery
Cons
- 13 inch swath is narrower than 16 inch rivals
- Spool handling takes practice
- Two-mode power instead of a true variable trigger
The LST136 is the trimmer I keep reaching for on one to two acres, and the reason is boring rather than exciting: nothing about it stops mid-job. The 40V MAX pack carries a state of charge indicator, the PowerCommand dial lets you trade runtime for cutting force, and the fast charger refills it in two hours or less. That is a full toolkit for property work.
With 8,376 reviews averaging 4.4 stars and 71% five-star votes, it is also the most proven pick in the group by a wide margin. Owners repeatedly point to the Automatic Feed Spool, which pays out line as it wears down instead of waiting for a bump. On a fence line where you stop and start constantly, that removes a small annoyance that adds up over an hour.
The 13-inch cutting width is the honest limitation. It is narrower than the 16-inch heads on the Greenworks, EGO and Milwaukee picks, so you will walk more ground to cover the same fence row. What you get back is a 7.8 lb tool and a kit that includes the battery, charger, spool, guard and auxiliary handle, which is more than several competitors ship.
Switching it to edger mode takes seconds, which matters because edging a driveway and trimming a ditch shoulder are usually the same afternoon. Owners do report that string loading feels fiddly on the first attempt, and that the two-speed selection is coarser than a true variable trigger. Neither stops you working.
What makes it the safest acreage buy
The charge indicator is the detail that changes a large-yard session. You can see how much pack is remaining and plan the last pass before the motor starts bogging down in thick grass, instead of finding out halfway through a tree line.
It also carries a 3 year limited warranty, and the included 8500 rpm motor is fast enough to shred tall weed growth rather than push it over. For a homeowner replacing a gas trimmer, this is the least dramatic upgrade that still gets the job finished.
Where it falls short on three acres or more
Thirteen inches of swath means roughly 25 percent more walking than a 16-inch head over the same property. On one to two acres of manageable growth that trade is worth the low weight. Past three acres of tall grass, the wider heads earn their keep faster.
Buy it with a second 40V MAX pack. The included fast charger handles one at a time, so a two-pack setup keeps the work moving without an hour-long gap in the middle of a Saturday.
2. BLACK+DECKER 40V MAX LST140C – The Lightest Tool for Long Sessions
Black+Decker 40V MAX 13 Inch String Trimmer and Lawn Edger with Battery and Charger, Cordless Weed Eater with Charge Indicator, High Torque PowerDrive Technology (LST140C)
40V MAX lithium platform
13 inch swath
6.4 lb tool weight
3 year warranty
Pros
- Lightest tool in the group at 6.4 lb
- AFS automatic line feed
- PowerDrive high torque drive
- Wall mountable charging base
Cons
- 13 inch swath is slow across acreage
- Two-mode power rather than variable trigger
- Included pack capacity is modest on thick overgrowth
At 6.4 lb this is the lightest trimmer here, and on a 90-minute session that difference is not cosmetic. Fatigue sets in through the arms and shoulders, and a lighter tool lets you finish the second fence row before the first one feels heavy. Owners who run the LST140C on acreage tend to talk about handling rather than power.
The PowerDrive high-torque transmission does more work than the 13-inch width suggests. With 5,739 reviews at 4.3 stars and 66% five-star votes, the pattern in the feedback is consistent: light, quick to convert from trimmer to edger, and easy to keep in the truck. The Automatic Feed Spool handles line advance, and the wall mountable charging base is a small thing that keeps a garage tidy.
The catch is the same as its sibling: 13 inches of cutting width. A few owners also point out that the included pack runs out sooner than they would like once the grass is thick and damp, and that the two-mode power selection is less refined than a variable trigger. If your property is a full acre of maintained edge work, none of that matters much.
Because the two BLACK+DECKER models share the same 40V MAX platform, a battery from one works in the other. Owners with more than one machine in the garage often keep the heavier LST136 for open field and use this one for detail work around beds and trees.
Who appreciates the low weight most
Smaller operators, older users and anyone working around obstacles where the head has to be steered rather than swung report this model most favorably. Seven pounds of tool plus a battery is manageable when the job involves ducking under fence rails and guiding the head around shrubs.
It is also the one we would hand to a second person in a household who only trims the front property. The 3 year limited warranty matches the LST136.
When the narrow head costs you
On open acreage with nothing in the way, swath is time. Every extra inch of cut width removes passes, and 13 inches is the smallest measurement on this list. If your growth is tall and dense, a bumpier 40V tool with more cutting force or a wider 16-inch head is a better use of the same platform.
Owners also note that the included pack capacity is the limiting factor on overgrowth. Add a second battery before you start thinking about a different tool, because the platform is shared.
3. EGO POWER+ ST1623T – The Best Cordless String Trimmer for Two Acres and Up
EGO POWER+ 16″ Cordless Weed Trimmer with Battery and Charger – ST1623T
56V ARC lithium platform
16 inch swath
Up to 60 min runtime
7.5 lb
5 year tool warranty
Pros
- Line IQ and Powerload remove all line handling
- Longest stated runtime here at 60 minutes
- 16 inch swath with 0.095 line
- Carbon fiber telescopic shaft
Cons
- One of the higher priced units in the group
- Line loading needs practice at first
- Included charger is a slower 320W unit
This is the pick for acreage, full stop. The ST1623T pairs a 16-inch cutting swath with LINE IQ, which senses line wear and feeds automatically, and POWERLOAD, which winds the spool with a button press instead of by hand. On a two-acre property where you reload line several times a session, that combination removes the single most tedious part of cordless trimming.
The included 4.0Ah pack is rated up to 60 minutes of runtime, the longest stated figure in this group, and the brushless motor keeps vibration low through a long pass. The telescopic carbon fiber shaft adjusts to the operator and folds down for storage in a truck bed, which matters when the tool lives in the vehicle rather than a shed.
Line in the box is 0.095 inch dual color, the thickest common trimmer line, and it runs through a 16-inch head. That combination is what gets it into standing weed and light brush instead of just clipping the tops. On r/landscaping, owners working brush and tall weeds single out the EGO trimmers as very powerful, and this is the model in that category with the widest swath.
The trade-offs are familiar. This is one of the more expensive units here, the included 320W charger takes close to an hour, and the auto-loader can over-feed line if you are not watching it. Owners also say the system rewards a short learning period. Budget an afternoon with the manual before your first big session.
Why the 56V platform is worth joining
The 56V ARC pack fits every EGO battery in the family, so the same battery that powers this trimmer can run a mower, blower or chainsaw. For someone trimming two acres, the trimmer is rarely the only tool that pack touches, and that shared platform is the real reason to pick this brand.
The warranty is 5 years on the tool and 3 years on the battery, the longest tool warranty in this group. That directly answers the common fear that a lithium tool bought today will not outlast a gas machine, since fuel engines have no sealed cells to age.
Where owners report friction
Edging is harder on the straight shaft than on a curved or loop-handle design, and owners on partially wooded acreage report it directly. The 16-inch head sits out in front of you, so getting a clean line along a garden edge takes more practice than with a compact 13-inch unit.
With a single 4.0Ah pack you get roughly an hour of work, which covers about an acre of typical edge trimming. Beyond this, a second battery is not optional.
4. Greenworks 80V 16 Inch Trimmer – Raw Power for Thick Growth
Greenworks 80V 16 in Cordless String Trimmer, 2.0 Ah Battery
80V platform
16 inch swath with 0.080 line
16 lb
Brushless motor
30 min charge
Pros
- 80V class torque on woody growth
- 30 minute rapid charging
- Brushless motor runs quiet
- 2.0Ah pack shares across 80V tools
Cons
- Heaviest tool in the group at 16 lb
- Bump feed head is awkward to reload
- Guard gives limited debris protection
When the growth is tall, damp or semi-woody, voltage starts to matter more than anything else on the list. This Greenworks runs on an 80V platform with a 16-inch cutting path and 0.080 dual line, and owners regularly describe clearing acreage-scale properties on a single charge. That is the workload the other picks here are built to handle, pushed harder.
The 2.0Ah pack rapid charges in 30 minutes, which is the fastest recharge figure in this group, and the brushless motor is quiet and maintenance free. On Chronicle Forums, owners running Greenworks describe a battery lasting about 30 minutes on real work, which is why they keep two. That two-battery rule is community consensus for this platform, and it holds up.
There is a weight problem. At 16 lb this is the heaviest trimmer in the roundup, and a shoulder strap is close to mandatory on a long session. The bump feed head is another recurring complaint, since winding the spool by hand is the slow, awkward part of the job, and a few owners report heads that stop bump-feeding and wear line quickly.
The guard also offers limited protection from flying debris, and there is no head-reverse capability for clearing a wound line. Those are small things until you are standing at the edge of a brush pile with the wrong end pointed at your shins.
What the 80V class actually buys you
More torque at the string, and that is the whole point. Tall grass that makes a 40V tool bog and stall will thin out under an 80V brushless motor, and the 16-inch swath means fewer passes across an open property. The variable speed trigger lets you back off around shrubs and beds where full speed wastes line.
Owners also like that the 2.0Ah pack is cross-compatible with other 80V Greenworks tools, so the same battery can move to a mower or blower in the same platform.
Who should pass on it
If your acreage is wooded, sloped or full of obstacles, 16 lb becomes tiring quickly, because you are lifting rather than sweeping. A shoulder strap helps, but the tool still asks more from your body than the 6.4 lb and 7.5 lb models in this group.
Line handling is the other reason to look elsewhere. If auto feed matters to you, the EGO and BLACK+DECKER options here avoid the manual spool step entirely.
5. DEWALT 60V DCST972X1 – The Adjustable Swath and Attachment Pick
DEWALT 60V Cordless String Trimmer with Battery & Charger Included, 17 Inch, Attachment Capable (DCST972X1)
60V MAX platform
15 or 17 inch adjustable swath
15 lb
Brushless motor
3 year warranty
Pros
- Swath adjusts from 15 to 17 inches
- Attachment capable across the 60V platform
- Quick-load spool simplifies line changes
- High and low speed plus variable trigger
Cons
- Among the more expensive options here
- 15 lb is heavy over long sessions
- Kit battery capacity is modest for the tool appetite
The DCST972X1 is the only trimmer here with an adjustable swath, moving between 15 and 17 inches with 0.080 dual line and accepting 0.095. On a large property that flexibility is more useful than it sounds: wide passes for open field, narrower for fence rows and tree lines where the head needs to be steered precisely.
It is also universal DEWALT attachment capable, so the same shaft takes hedge, brush and other attachments. Owners with 1,070 reviews at 4.3 stars and 72% five-star votes highlight the brushless power, the quick-load spool and the platform flexibility. On r/lawncare, a homeowner working about 2.5 acres recommended DeWalt 60V with two or three batteries, saying they had never been unhappy with the setup.
The weight is the issue. At 15 lb it is the second-heaviest tool here, and extended trimming on that mass is tiring. Owners also point out that the battery and charger capacity included in the kit is modest relative to how much the tool consumes, which is another way of saying the same thing: buy spare packs.
At 8000 rpm no-load speed the brushless motor has plenty of headroom for tall grass. The variable trigger with high and low speed lets you dial the power down when you are working near a garden bed and up when you are cutting a drainage shoulder.
Why attachment capability matters on acreage
On a large property the trimmer is rarely the only job. Hedge work along a property line, brush cleanup and edging all need a second tool, and attachment capability means one battery platform covers them. Over several acres that consolidation is worth more than a small spec gain in any single machine.
The adjustable swath is the quiet advantage. Owners who switch it to 17 inches for open ground report noticeably fewer passes, then drop to 15 for the tight work, which is exactly the pattern large-property use calls for.
Where it gets uncomfortable
Fifteen pounds over an hour of sweeping is real fatigue, and the people who like this tool most are those who pace themselves or use a strap. It is a strong performer in short bursts and a demanding one across a whole afternoon.
The included pack is not the battery to buy the tool with. Plan on two additional 60V packs and a charger that refills them quickly, and treat those packs as the actual purchase decision.
6. Kobalt 80V Max Baretool – Best Value 80V Power
Kobalt 80-Volt Max Baretool 16-in Straight Cordless String Trimmer 2nd Generation (Battery Not Included)
80V MAX platform
16 inch swath
10.7 lb
6500 rpm
Battery and charger not included
Pros
- 4.5 star average across 344 ratings
- 16 inch swath covers ground quickly
- 80V torque at a bare tool price
- Second generation straight shaft
Cons
- Battery and charger sold separately
- Closed 80V platform with fewer cross tool options
- Smaller review base means a shorter reliability record
This is the value entry into the 80V class, and its 4.5 star average is the highest number in this group, with 74% five-star votes. The second-generation straight-shaft design gives you a 16-inch cutting width, 6500 rpm and 80V torque at a bare tool price, which is a combination the other 80V option here does not offer this cheaply.
It is sold as a bare tool, so the 80V battery and charger are separate purchases. For someone who already owns 80V packs, that makes this an unusually cheap way to add a wide-head trimmer to a garage. For someone starting from nothing, add the cost of a pack and a charger before comparing it against the kits above.
Two caveats come up repeatedly. The Kobalt 80V platform is closed, with fewer cross-tool options than the EGO, DEWALT or Greenworks families, so the battery you buy serves a smaller range of equipment. And 344 ratings is a much thinner review base than the 8,376 behind the BLACK+DECKER LST136, so the long-term reliability record is less established.
At 10.7 lb it sits in the middle of the weight range here, heavy enough to feel stable in thick growth and light enough to keep swinging for a full pass without a strap.
Who should buy the bare tool version
If you already have 80V Kobalt packs, this is close to a no-brainer. You are buying a 16-inch straight-shaft trimmer without paying twice for batteries you already own, and the tool itself is the part that wears out.
Owners rate the power-to-cost ratio highly, and the straight shaft suits users comfortable with full-size commercial-style trimmers, particularly if you also plan to run brush through it.
Where the closed platform bites
Platform depth is the real cost here. The EGO 56V, DEWALT 60V and Greenworks 80V families each power a mower, blower, chainsaw and hedge tool, so a pack you buy keeps working after the trimmer does. A closed platform narrows that return.
And with a small review base, you are buying on spec and rating rather than on a decade of owner reports. For a first large-property purchase, the broader ecosystems are safer bets.
7. WORX WG183 40V – Two Batteries in the Box
Worx Cordless String Trimmer, 40V 13″ Electric Weed Wacker, WG183
PowerShare 40V from two 20V packs
13 inch swath
6.4 lb
Two 2.0Ah batteries included
Pros
- Two batteries and a dual charger ship in the box
- 6.4 lb keeps long sessions manageable
- Dual-exit head improves cutting efficiency
- Auto feed spool reduces interruptions
Cons
- 13 inch is the smallest swath here
- 40V from two packs gives less force than 60V to 80V rivals
- Auto feed spool can jam and need manual feeding
The WG183 solves the two-battery problem by shipping with it. Two 20V 2.0Ah packs and a dual charger come in the box, so you can work one while the other charges without buying anything else. For a first cordless purchase on a large property, that removes the most common complaint in this category outright.
With 1,464 reviews at 4.2 stars and 66% five-star votes, the feedback centers on the light 6.4 lb weight, the included kit and the auto-feed spool. The dual-exit cutting head pushes line out both ends of the spool, which improves cutting efficiency compared with a single-exit head of the same size.
What it does not have is force or width. 40V from two 20V packs sits well below the 60V to 80V machines in thick growth, and the 13-inch swath is the smallest here. Owners report the auto-feed spool jamming at times and requiring manual line advancement, which is the one job stoppage you would prefer not to have on a fence line.
The PowerShare platform is the underrated part. The same batteries run across WORX 20V and 40V tools, so mowers, blowers and trimmers share packs, and the included adjustable auxiliary handle helps on uneven ground.
Best fit for a first cordless setup
Someone moving off gas with one to two acres of moderate growth gets a working kit without a second round of purchasing. Two packs out of the box means the swap happens in the driveway, not after a trip to the store mid-job.
The 6.4 lb weight and 7000 rpm speed make it a comfortable tool for a beginner, and the adjustable handle helps if more than one person uses it.
Where the 40V ceiling shows
Thick, wet, knee-high grass is where a 40V platform starts to feel the difference. In that condition owners report bogging and shorter sessions, and a 13-inch head means more passes to cover the same ground. It is a good tool for maintenance, not for annual overgrowth recovery.
If you have brambles or brush to clear, look at a wider head with more torque instead. The two-battery convenience is real, but it does not add cutting force.
8. RYOBI 40V HP Attachment Capable – The Expand-It Workhorse
RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer, 4.0 Ah Battery and Charger Inc
40V lithium platform
13 to 15 inch adjustable swath
13.9 lb
4.0Ah battery included
Pros
- 4.0Ah high capacity pack outlasts smaller ones
- Attachment capable for brush cutters
- Variable speed trigger for control
- Adjustable cutting width
Cons
- 13.9 lb is heavy over long jobs
- Bump feed head is awkward to load
- Runtime in tall dense growth is under the advertised figure
Two things set this Ryobi apart on a large property: a 4.0Ah high-capacity battery in the box, and an attachment-capable shaft that accepts RYOBI expand-it and universal gas attachments. That second feature means the same power head can take a brush cutter when brambles show up, which is the job a string trimmer was never built for.
The 1,673 reviews at 4.2 stars and 69% five-star votes show owners valuing battery capacity, attachment versatility and the low maintenance compared with gas. The cutting width adjusts between 13 and 15 inches, and the variable speed trigger gives real control when you are working around shrubs or edging a path.
Owners also flag where the experience falls short. At 13.9 lb it is heavy, and a shoulder strap makes a long job bearable. The Reel-easy bump-feed head takes practice, line can unwind awkwardly during loading, and the guard can loosen enough to need a screwdriver. Several reviewers note that runtime in very tall, dense growth is closer to 30 to 40 minutes than the advertised hour, which is an honest and useful warning.
The 90-minute included charger is also the slowest here. Budget for a faster charger if you plan long sessions, or plan the swap cycle around it.
Why the attachment shaft matters on acreage
Over a couple of acres you will hit growth that nylon line cannot handle, whether that is blackberry canes, saplings or vine-choked fence corners. A trimmer that accepts a brush cutter attachment turns one purchase into two tools, and the battery you already have powers both.
That flexibility is why this one earns its place on a wooded property where a 16-inch open-field head would be the wrong shape for the work.
Where owners run into trouble
The bump-feed head is the most common friction point, and line loading is where most of the complaints land. If you change line often or work in abrasive grass that snaps line at the head, an auto-feed design like the EGO or BLACK+DECKER spools saves time over a season.
Weight and charger speed are the other two. Neither is a dealbreaker on two acres, but both are tiring across a full afternoon in tall growth.
9. EGO POWER+ ST1511T – The Balanced 15 Inch Pick
EGO Power+ 15″ Cordless Weed Trimmer with Battery and Charger – ST1511T
56V ARC lithium platform
15 inch swath with 0.095 line
10.3 lb
Up to 45 min runtime
5 year warranty
Pros
- Powerload winding makes line changes nearly instant
- 0.095 line handles vines and light brush
- Telescopic shaft adjusts and folds for storage
- Two speed trigger trades speed for line life
Cons
- 10.3 lb feels heavy for smaller operators
- Single 2.5Ah pack covers about 45 minutes
- Sparse assembly instructions
- Some line retention reports after months
The ST1511T sits between the two EGO trimmers here in size and price, with a 15-inch swath, 0.095 inch line and a telescopic aluminum shaft. It is a sensible middle choice for one to two acres where the 13-inch models feel narrow and the 16-inch ST1623T is more machine than the property needs.
POWERLOAD winds the line with a button press, the same system as the larger EGO, and the included 2.5Ah pack is rated for up to 45 minutes and charges in 50 minutes on the supplied charger. With 2,037 reviews at 4.4 stars and 75% five-star votes, owners consistently mention the winding convenience, strong cutting on thick weeds and smooth edging.
The reservations are consistent across reviews. At 10.3 lb it feels heavy to smaller operators, and one 2.5Ah pack covering roughly 45 minutes means a second battery is needed for anything beyond an acre. Assembly instructions are sparse enough to cause confusion at the shaft collar, and a minority report the head retaining new line poorly after a few months.
The 5 year tool warranty and 3 year battery warranty apply here, matching the flagship EGO, and the same 56V ARC battery family powers every EGO tool.
The balanced choice for one to two acres
Fifteen inches is a meaningful step up from 13 without the bulk of a 16-inch head. For a property with fence lines, a driveway edge and some open field, that middle number usually covers the whole job in one tool.
Owners also single out the balance as better than heavier units here, which is why it works for long sessions despite the 10.3 lb figure. The telescopic shaft adjusts to the operator, which matters in a household with more than one user.
Where the single pack becomes a problem
Forty-five minutes of runtime covers a good session on half an acre to an acre. Push to two acres of moderate growth and you will want a second 56V pack on the charger before you start, not after the motor starts to bog down.
The line retention reports are worth checking on your own setup after a few months. If it applies, the head is replaceable, but it is a known cost of ownership on this design.
10. Milwaukee M18 2828-20 – Lightweight Pick for Existing M18 Owners
Battery Powered M18 Brushless String Trimmer (Tool-Only) 2828-20
M18 18V system
16 inch swath
7 lb tool only weight
6200 rpm
Battery sold separately
Pros
- Light 7 lb bare tool for maneuvering
- 16 inch swath accepts 0.080 and 0.095 line
- Battery platform already widely owned
- Budget friendly tool only configuration
Cons
- Tool only
- battery and charger sold separately
- 18V gives less sustained torque on thick growth
- String spool reported to jam
- Bulky guard makes edging awkward
The Milwaukee M18 2828-20 is the lightest 16-inch head in this roundup at 7 lb, and it is sold as a tool only. If your garage already holds M18 packs from a mower, blower or drill, that makes it one of the least expensive ways to add a wide-swatch trimmer, and the platform is the most widely owned of the families listed here.
The brushless motor reaches up to 6,200 rpm and the 16-inch cutting swath accepts both 0.080 and 0.095 line. Owners report ample power for weeds and light brush, with the light weight the most common point of praise in a 166-rating review base at 4.2 stars.
Why 18V gets a pass on acreage
Forum consensus on battery lawn gear is consistent: sub-40V platforms are fine for light maintenance and fall short on acre-plus work. The 18V pack delivers less sustained torque than the 60V to 80V machines here, which shows up as bogging in tall, dense growth rather than a hard stop.
On half an acre to an acre of ordinary edge trimming, with tall grass, the light weight and wide head are a good pairing. Add high-capacity M18 packs, because the runtime ceiling on this platform is lower.
Where owners report problems
The spool on this design is reported to jam and require disassembly, which is the most serious complaint in the reviews. The motor cooling vents also clog quickly with grass debris and need regular clearing, and the line guard is bulky enough to block your view when edging.
Because it is tool only, the real cost depends entirely on what you already own. Starting from zero, add two high-capacity M18 packs and a charger to the picture before comparing this against the kits above.
How to Choose a Cordless String Trimmer for a Large Yard
Everything above comes down to a handful of numbers, and those numbers are the same for every model on this list. Here is how to size them for your own property before you spend anything.
1. Size the battery to your acreage, not the runtime claim
Manufacturer runtime figures assume light, dry, evenly cut grass. One owner on r/lawncare with 1.5 acres in North Texas logs about 90-minute sessions containing roughly 45 minutes of active run time, and asked directly whether one pack could cover it. It cannot, and that gap is the whole reason owners end up with stop-start work and an hour-long wait for the charger cycle.
The useful version of the question is simple: how many packs do you need for a session?
Up to half an acre of maintained edges: one 2.0Ah to 4.0Ah pack, charging between passes.
One acre with mixed fence lines and open field: two packs, ideally 4.0Ah or larger.
Two acres, or one acre of tall growth: two to three 4.0Ah to 8.0Ah packs, or a 60V to 80V platform.
Three acres or more, or annual overgrowth recovery: three or more high-capacity packs, plus a fast charger.
Two packs is the practical minimum on acreage, and it is what owners running Greenworks describe when they say a battery lasts about 30 minutes, so they have two. Plan for a third if your property has more than one wooded edge.
2. Voltage tiers: 20V versus 40V versus 60V and 80V
Direct answer to the most common question on this topic: 40V is the minimum worth considering for a large yard, and 60V or 80V is what you want for thick growth or more than two acres. 20V, which is really an 18V pack, is a suburban-lot platform.
18V and 20V: 13 to 16 inch heads, light tools, best for under an acre of light maintenance.
40V: 13 to 15 inch heads, the entry point for one to two acres, and the level forum advice says not to go below.
56V and 60V: 15 to 17 inch swaths, brushless motors, the sweet spot for two acres and heavy weeds.
80V: 16 inch heads, the most cutting force available cordless, heaviest tools, best for tall and woody growth.
Within those tiers, cut path matters as much as the voltage number. A 16-inch head at 60V covers ground faster than a 13-inch head at 80V, because swath is a direct multiplier on how much you walk.
3. Volts versus amp-hours is the number that predicts session length
Sixty volts with a 2.0Ah pack carries far less usable energy than 20 volts with a 6.0Ah pack, even though the voltage headline sounds more powerful. Runtime follows total energy, which is the voltage multiplied by the amp-hour rating. Large-voltage platforms compensate with bigger packs, which is why the Greenworks 80V machine ships with a 2.0Ah pack and still finishes a session.
This is the fact behind most runtime complaints. Owners running smaller packs report roughly 15 minutes on thick growth before swapping, while larger 4.0Ah and 8.0Ah packs in the same platform run far longer. Judge the battery by the Ah number on the label, not the volts on the box.
4. Cutting swath: why 13 inches is wrong past one acre
Swath is the width of grass the head sweeps in one pass, and it multiplies directly into time. Sixteen to seventeen inches covers a property faster than 14 to 16 inches, which covers it faster than 13 inches. On open acreage that difference is measured in finished hours rather than minutes.
Pair wider swaths with a brushless motor and a die-cast gearbox, because both resist the heat and impact that come from thick growth. The models above that run brushless motors are the ones we would trust for tall grass work.
5. Line feed and line diameter
Bump feed advances line when you tap the head on the ground, auto-feed pays it out as it wears, and systems like POWERLOAD wind a full spool from a button press. On acreage, where you reload many times a session, auto-feed and Powerload save real minutes. Bump feed is fine, but it stops you, and stopping is what eats a session.
Line diameter follows the job. 0.065 inch suits grass and light edging, 0.080 inch handles weeds and light brush, and 0.095 inch is what you want for vines, brambles and dense growth. For woody brush, a metal blade or a dedicated brush cutter is the correct tool rather than thicker line. We covered general cordless trimmers in more detail in our cordless string trimmer roundup, which is worth reading if your property is under an acre.
6. Shaft, handle and all-day ergonomics
Weight is only half the comfort equation; balance decides the rest. Tools between 6 and 8 lb are easy to swing for a full session, while anything over 13 lb wants a shoulder strap and slower pacing. Owners on iRV2 describe a platform trimmer as heavy with an awkward weight distribution and a finicky trigger, which is a fair warning to try one in a store if you can.
Shaft style changes handling too. Straight shafts reach into brush and under fence rails, loop handles balance well on rough ground, split shafts are easier to load line on, and telescoping shafts fit different users and fold for storage. Edge performance varies: straight-shaft trimmers are harder to run along a garden border, which owners on wooded acreage report with EGO models specifically.
7. Platform lock-in and the true cost of ownership
The pack you buy powers more than one tool. EGO 56V, DEWALT 60V, Milwaukee M18, Greenworks 80V and WORX PowerShare each cover a mower, blower, chainsaw and hedge tool, so the battery cost gets spread across several machines. A closed platform like Kobalt 80V offers less of that return.
That is also why a bare tool can be the smarter purchase. The Kobalt 80V and Milwaukee M18 trimmers on this list are tool only, which makes them cheap additions for owners who already hold packs. Starting from zero, budget for the tool, two or three batteries and a fast charger, because the headline number on the box rarely covers it. Our hedge trimmer picks share the same platform logic if you want to build out a full battery set.
Warranty length is the hedge against the fear that a lithium tool will not last a decade. The EGO models carry 5 year tool warranties, DEWALT and BLACK+DECKER cover 3 years, and sealed lithium cells have no carburetor, spark plug or fuel line to fail.
8. Cordless versus gas: the honest crossover
Under roughly one acre of light growth, cordless wins outright. No fuel mixing, no pull cord, no exhaust, low noise for neighbors and near-zero maintenance, which is why most people converting from gas stop at one acre.
Past two acres of tall, thick or woody growth, or for an annual abandoned-overgrowth job, gas or a dedicated brush cutter still gets the work done faster. High-voltage cordless machines close the gap on power, but pack swaps and charging still add hours that a fuel tank does not. The honest answer is that cordless has taken over maintenance trimming and has not taken over reclamation work.
If your property is that size, plan the work around the battery count rather than around the tool. A second pack charging while you trim the first one turns a hard job into an ordinary afternoon. If the acreage is large enough that you are also weighing powered mowing equipment, our garden tractor picks for large yards cover that side of the same property.
Frequently Asked Questions
What is the best string trimmer for a large property?
The BLACK+DECKER 40V MAX LST136 is our pick for large properties up to about two acres. Its 40V MAX battery, 13-inch swath and Automatic Feed Spool keep a session moving without manual line bumping, the 7.8 lb body stays manageable over long jobs, and the kit includes a battery, charger and fast two-hour recharge. Add a second 40V MAX pack, because one pack rarely covers a full afternoon on acreage.
What is the highest rated cordless string trimmer?
By average rating, the Kobalt 80V Max bare tool leads at 4.5 stars, though it rests on a much smaller review base of 344 ratings. The most proven pick is the BLACK+DECKER LST136 at 4.4 stars across 8,376 reviews, which is a stronger signal of long-term reliability. Two EGO models also hold 4.4 stars with more than 2,000 reviews each.
Which is better for a cordless trimmer, 20V or 40V?
For a large yard, 40V is the practical minimum and 60V or 80V is better for thick growth. An 18V or 20V platform is built for suburban lots under an acre and lacks the sustained torque to push through knee-high grass. If you already own 20V packs, a 20V tool is a reasonable way to start, but sizing to acreage rather than to a platform means stepping up a tier.
Which cordless string trimmer has the best battery life?
The EGO POWER+ ST1623T states up to 60 minutes on its included 4.0Ah 56V pack, the longest rated runtime in this group, and the EGO ST1511T states up to 45 minutes on 2.5Ah. Real numbers on thick, damp grass run shorter, so judge runtime by the Ah rating on the battery rather than the published figure, and carry at least two packs on acreage.
How many batteries do I need to trim 2 acres?
Two high-capacity 4.0Ah or larger packs handle two acres of moderate growth, and three is safer if the growth is tall or you have wooded edges. Owners across lawn forums describe two batteries as the practical minimum, and one as a recipe for stop-start work. On a 60V to 80V platform the packs are larger and two may be enough for well-kept ground.
Are gas string trimmers better than electric for large properties?
Under about an acre of light growth, cordless wins on noise, maintenance and convenience. Past two acres of tall, thick or woody growth, gas or a brush cutter still finishes faster because refuelling takes seconds while pack swaps and charging take an hour. Most owners use both, keeping cordless for routine maintenance and gas for annual overgrowth and reclamation work.
Bottom Line
The BLACK+DECKER 40V MAX LST136 is the best cordless string trimmer for large yards overall, and the EGO POWER+ ST1623T is the right upgrade when you are clearing two acres or more. The Kobalt 80V bare tool is the value route if you already hold 80V packs. The variable that should decide the buy is battery count, not brand: two packs minimum on acreage, three for wooded or overgrown ground.