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A battery lawn trimmer is supposed to free you from the gas can and the extension cord, but the real question is whether it can actually cut through thick grass without dying halfway down the fence line. The best models balance power, runtime, and weight so you finish the job in one go without your arms aching. This guide breaks down seven cordless trimmers to help you pick the one that fits your yard and your grip.
I’m Rikta — the founder and writer behind Lawn Gear Lab. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Whether you have a small lot or a sprawling lawn, the right battery lawn trimmer depends on cutting width, battery voltage, and how easily it switches between trimming and edging, which is exactly what we cover in the reviews below.
Our Picks at a Glance
How To Choose The Best Battery Lawn Trimmer
The right battery lawn trimmer feels like an extension of your arm — light enough to swing, strong enough to slice, and with a battery that lasts until you put it away. Here are the three specs that separate the tools you reach for from the ones you wrestle with.
Cutting Width and Power
The cutting width, measured in inches, tells you how much grass you clear with each sweep. A 12-inch swath works fine for small yards and tight corners, while a 13-inch head covers more ground and cuts down your trimming time on larger lawns. Matching that to the motor, look at the no-load speed (RPM) — higher numbers like 11,000 or 15,000 RPM mean the head spins faster and handles thicker weeds without bogging down.
Battery Platform and Runtime
Battery voltage (20V vs 21V) and capacity (amp-hours) directly affect how long you can work and how much power the trimmer delivers. More amp-hours, such as 4.0Ah or 6.0Ah, mean longer runtime per charge so you are not swapping batteries mid-yard. Equally important is whether the brand offers a shared battery system — if the battery fits other tools like a leaf blower or chainsaw, you build a versatile fleet instead of collecting chargers.
Automatic Line Feed and Ease of Use
Nothing kills momentum faster than stopping to bump or manually pull out more trimmer line. An automatic feed system (often labeled AFS or Command Feed) advances the line every time you start the tool, keeping you cutting without a pause. Also check the conversion to edging mode — a simple pivot or pedal-operated rotation lets you switch between trimming and edging in seconds, making your tool far more versatile.
Quick Comparison
| Model | Best For | Cutting Width | Voltage (V) | Batteries Included | Amazon |
|---|---|---|---|---|---|
| WORX WG163★ Best Overall | Lightweight everyday trimming | 12 in. | 20V | 2 | Amazon |
| CRAFTSMAN V20Also Great | Long runtime on a large yard | 13 in. | 20V | 1 (4.0Ah) | Amazon |
| BLACK+DECKER LST522 | Versatile trimming & wheeled edging | 12 in. | 20V | 1 (2.5Ah) | Amazon |
| FOKIKIP 12″ 21V | Two batteries & extra spools | 12 in. | 21V | 2 (2.0Ah) | Amazon |
| JYGMPRO 21V | Tackling brush with metal blades | — | 21V | 2 (2.0Ah) | Amazon |
| WeGofly 13″ 4-in-1 | Maximum power & huge battery | 13 in. | 21V | 2 (6.0Ah) | Amazon |
| BLACK+DECKER LST300 | Budget-friendly brand reliability | 12 in. | 20V | 1 (2.0Ah) | Amazon |
In‑Depth Reviews
1. WORX Cordless String Trimmer & Lawn Edger (WG163)
Our pick — over 4★ from 27,500+ verified ratings; the strongest balance of quality and price.
At 5.5 pounds, this trimmer makes yard work feel almost easy.
Weight is the deciding factor for many buyers, and at just 5.5 lbs the WORX WG163 is one of the lightest trimmers you can pick up without sacrificing cutting ability. The 20V Power Share maxLithium system includes two batteries, and the 7600 RPM no-load speed gives you enough power for regular grass and light weeds around a quarter-acre lot. The innovative push button command feed spool lets you advance the line instantly with a push of a button, so you never have to bump the head on the ground.
This trimmer converts from a string trimmer to an edger in seconds, and the head tilts 90° for handling sloped terrain. Buyers consistently praise the lightweight design, with one reviewer saying, “after 30 minutes it had only used one bar of the battery.” Another owner noted their first WORX trimmer lasted 8-9 years before the battery started losing power. Compared to the FOKIKIP model, the WORX offers a touch less voltage (20V vs 21V) but a proven brand track record and a very light feel in hand.
Strengths
- Ultra-light at 5.5 lbs reduces arm fatigue
- Easy push-button line feed
- Part of the WORX Power Share family for tool compatibility
Weaknesses
- Small batteries mean shorter runtime per charge
- The charger is slow, taking hours to refill each battery
- Adjusting the height can be stiff for some users
Reach for this if: you have arthritis, a smaller frame, or simply want the lightest trimmer that still does a solid job on a medium yard.
Look elsewhere if: you need to edge long paths regularly — the large guard makes edging trickier than with a dedicated wheeled edger.
2. CRAFTSMAN V20 String Trimmer and Lawn Edger Kit (CMCST901M1)
The long-running workhorse that keeps cutting long after the others have quit.
The standout feature here is the runtime — the included 4.0Ah battery delivers up to 63 minutes of trimming, which is enough for most medium to large yards in a single session. The motor also delivers increased power, helping it slice through thick grass without slowing down.
This trimmer covers a 13-inch cutting swath, meaning you clear more ground with each pass compared to the 12-inch models from BLACK+DECKER. It also converts to an edger using the Turn-To-Edge functionality, so you clean up sidewalk borders without grabbing a second tool. At 4.6 out of 5 stars from 73 ratings, buyers report the battery lasting through their whole yard without running out, and one reviewer noted that despite handling really thick weeds, the trimmer stays lightweight and easy to use.
Why it leads the pack
- Up to 63 minutes of runtime per charge
- 13-inch cutting width covers a large area fast
- Two-speed settings let you prioritize runtime or power
- Part of the V20 battery platform for shared tool compatibility
The trade-offs
- Only one battery included
- Light strings mean edging is less aggressive than a dedicated edger
- Some owners mention needing to re-wrap the string for reliable feeding
The verdict: For yard owners who want a single trimmer that powers through a full afternoon of work without needing a recharge, this is the pick.
Consider something else if: your trimming is limited to a 20-minute fence line and you don’t need the extra 4.0Ah battery capacity.
3. BLACK+DECKER 20V MAX 12 Inch Weed Eater (LST522)
Trims and edges with guide wheels for the straightest lines on your driveway.
This model stands out because the included wheeled edger attachment supports and guides the tool, giving you a clean, professional line along sidewalks and flower beds without the wobble of freehand edging. You get two-speed control — higher power for thick growth or longer runtime for extended jobs — and the AFS (Automatic Feed Spool) system advances the line automatically so you never bump the head to get more string.
The PowerDrive Transmission boosts the torque at the string, making the 12-inch cutting width feel stronger than its rating suggests. Compared to the standard BLACK+DECKER LST300, this model includes the LBXR2520 battery offering 66% more runtime than the standard battery, so you spend less time charging and more time cutting. Customers note that the adjustable length and rotatable head make it comfortable for shorter users, with one buyer mentioning it is “perfect and lightweight for smaller women.”
Who it’s for: Anyone who edges a long driveway or sidewalk and wants the same clean line every time without stooping.
The catch: The two-speed control is not the most intuitive to switch on the fly, and some buyers found the user manual lacking details on how the auto-feed mechanism works.
4. 12″ 21V Weed Wacker Cordless by FOKIKIP
Two batteries and six extra spools so you trim first, recharge never.
With 2 x 2.0Ah lithium batteries included and a fast charger, this trimmer delivers up to 45 minutes of cordless runtime when you alternate packs. The 21V motor gives it a slight voltage edge over the 20V BLACK+DECKER models and the dual-speed control lets you switch to a higher setting when you hit dense weeds. The automatic line feed system advances the trimmer line each time you start the machine, so you spend less time fussing and more time moving.
Switching from string trimming to edging mode is done by stepping on a pedal and rotating the head 90°, which is a clever hands-free design. Reviewers point out it is lightweight, easy to assemble, and the batteries last long enough to finish a small to medium yard. One buyer mentioned that the adjustable head with the guide wheel makes edging along the driveway much cleaner than they expected.
What it beats: The extra spools (6 total) mean less frequent buying of replacements, and the 21V battery offers a touch more power than the WORX WG163’s 20V system.
Consider this if: you want enough runtime and accessories in the box to tackle an entire yard without stopping for recharge breaks.
5. JYGMPRO 21V Cordless String Trimmer
Metal blades turn this trimmer into a brush cutter for woody stems and brambles.
The JYGMPRO is not just a grass trimmer — it includes two types of heavy-duty blades (diamond-shaped blades and circular saw blades) so you can swap out the trimmer line for serious cutting power through thick brush. The 21V pure copper motor spins at an impressive 11,000 RPM, and the 400W output means it slices through overgrown grass and stubborn weeds without stalling. The package comes with 2 x 2.0Ah lithium batteries, giving you up to 30 minutes of runtime per charge, with a full charge taking roughly 3 hours.
This is a 3-in-1 tool, converting between a grass trimmer, edger, and brush cutter. The cutting head rotates 90° for edging, and the telescopic shaft extends from 33.5″ to 47.2″, accommodating users of different heights. One owner reported that it “mows the lawn and weeds easily” and that the battery lasts a long time, though a different reviewer felt the build quality felt cheap. The dual-action safety lock prevents accidental startups, which is a welcome feature when carrying metal blades.
Best for: Anyone with woody shrubs, brambles, or a fenceline that needs brush cutting rather than just grass trimming.
The trade-off: Some owners found the initial quality to feel toy-like, so this is a use-case-specific buy rather than an everyday trimmer for a manicured lawn.
6. WeGofly 13″ 4-in-1 Cordless String Trimmer
Two 6.0Ah batteries mean you can trim for hours without touching a charger.
The upgraded brushless motor hits 15,000 RPM and uses a premium steel gear set to avoid jamming or burning out, even when you push through heavy brush. The 13-inch cutting width is the largest here, matching the CRAFTSMAN V20.
The 4-in-1 design means it works as a string trimmer, lawn edger, mini lawn mower, and brush cutter, and you can swap between trimmer lines, metal blades, and saw blades depending on the job. Buyers have been impressed with the sheer power — one customer observed, “the metal blade work it went right through heavy grass and some brush mixed in.” Another reported finishing a two-day brush clearing job with no issues, praising the battery life and lightweight build.
The biggest advantage: The 6.0Ah batteries provide more capacity than the 2.0Ah packs included with most other trimmers, so you rarely need to swap or recharge mid-job.
The honest trade-off: The auxiliary pull screws can come loose during use, which may require some extra tightening or even replacement screws over time.
7. BLACK+DECKER 20V MAX String Trimmer and Edger (LST300)
A proven, lightweight trimmer that asks for very little money and delivers a lot.
The LST300 is the affordable entry point into the BLACK+DECKER 20V MAX system, and it has been a top seller for years thanks to a simple formula: it is light, it works, and the battery platform is shared across dozens of other tools. The PowerDrive Transmission delivers 6200 RPM, and the Automatic Feed Spool (AFS) releases new line whenever the tool needs it, without bumping.
This trimmer comes with one 2.0Ah battery, which offers improved runtime — real-world use suggests about 15 minutes of continuous cutting per charge, according to some reviewers. The 12-inch cutting swath is standard, and the 2-in-1 conversion to edging mode is quick and tool-free. While it only includes one battery compared to the two you get with the FOKIKIP or WORX models, buyers praise the auto-feed system and the tool’s overall value, noting that it “powers through weeds and tall grass” and is easy to maneuver.
Good
- Very affordable entry into the BLACK+DECKER battery system
- Lightweight design reduces fatigue
- Auto-feed AFS system works reliably
Less good
- Shorter runtime — about 15 min per charge reported by some users
- Long charge time of several hours
- Less powerful than the older model it replaced, according to some reviewers
Reach for this if: you already own BLACK+DECKER 20V tools and want a lightweight trimmer at the lowest possible buy-in.
skip it if: your yard takes more than 20 minutes to trim, because you will need to recharge the single battery between sessions.
Understanding the Specs
Voltage (V) and Amp-Hours (Ah)
Voltage determines the motor’s potential power — a 21V motor is slightly more powerful than a 20V one, giving you better resistance against bogging down in thick weeds. Amp-hours (Ah) measures the battery’s energy capacity: more Ah means you can run the trimmer for longer before needing a recharge. For example, a 6.0Ah battery will last longer than a 2.0Ah battery on the same trimmer, assuming the same workload.
Cutting Width (inches)
The cutting width is the diameter of the circle the trimmer line makes when spinning. A 12-inch head is nimble and fits into tight spaces between flower beds, while a 13-inch head cuts a wider path, reducing the number of passes needed to clear a large lawn. The trade-off is that a wider head sometimes feels heavier and less maneuverable in corners.
RPM (No-Load Speed) and Brushless Motor
Revolutions per minute (RPM) measures how fast the trimmer head spins when it is not cutting anything. Higher RPM generally means the line cuts through grass faster and handles thicker weeds more easily. A brushless motor is more efficient than a brushed motor — it generates less heat, delivers more torque, and extends both battery life and the tool’s lifespan, though it typically costs more upfront.
Automatic Line Feed Systems
Bump feed systems require you to tap the trimmer head on the ground to release more line. Automatic feed systems (like AFS or Command Feed) advance the line as needed without any bumping, often triggered by the process of starting the tool. This means you never stop to manually adjust the line, which is a major convenience during long trimming sessions.
FAQ
How long does a battery lawn trimmer battery last?
Can a battery trimmer replace a gas-powered weed wacker?
What does a 2-in-1 trimmer and edger mean?
Is 20V enough power for a string trimmer?
Are battery trimmers lighter than gas trimmers?
What is AFS in a BLACK+DECKER trimmer?
Can I use third-party batteries in my battery trimmer?
How often do I need to replace the trimmer line?
What is the advantage of a brushless motor in a trimmer?
Can I use a battery trimmer on wet grass?
Final Thoughts: The Verdict
Across the board, the battery lawn trimmer winner is the CRAFTSMAN V20 because it delivers the longest real-world runtime with a 4.0Ah battery and a wide 13-inch cutting swath, making it ideal for medium to large yards. If you want a lightweight everyday trimmer that is easy on the arms, grab the WORX WG163. And for tackling heavy brush and weeds with the power of metal blades and massive 6.0Ah batteries, the standout is the WeGofly 4-in-1.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Lawn Gear Lab earns from qualifying purchases. This does not affect which products we feature.