Best Battery Lawn Trimmer Reviews: 5 Cordless Models That Actually Earn Their Spot

You know the drill. You pull the cord on your old gas trimmer twenty times, it finally sputters to life, and then it dies the moment you hit a thick patch near the fence. Or you drag an extension cord across the yard, careful not to slice through it, while the plug keeps pulling loose from the outlet. Battery trimmers promise to end that nonsense, but picking one means sorting through a lot of marketing noise about voltage, amp-hours, and cutting width.

After spending weeks running these five cordless trimmers through real grass, thick weeds, and edging duty along driveways, the differences become obvious. It’s not about which one has the biggest number on the box. It’s about how the weight balances in your hands, how fast the line feeds when you’re mid-swing, and whether the battery actually lasts long enough to finish the job you bought it for. Runtime claims on packaging rarely match what happens when you’re cutting damp St. Augustine grass in July.

This roundup covers five battery trimmers that earned their place through hands-on use, not spec sheets. You’ll find a dependable 2-in-1 from WORX, a powerful 40V option from Black+Decker, and three lighter models that solve specific problems like storage space or budget limits. We tested each one the same way, ran batteries dead, timed reloads, and measured how they handle slopes and tight corners. Here’s what we found.

Here is a quick look at how the key specs stack up across these five models.

Features	WORX WG163	Black+Decker LST140C	WeGofly 4-in-1	HEYWORK 20V	KOMASTY 20V
Voltage	20V	40V MAX	21V	20V	20V
Cutting Width	12 inches	13 inches	13 inches	12 inches	12 inches
Line Feed	Push button	Automatic	Manual bump	Automatic	Automatic
Included Batteries	1 (sold with tool)	1 (included)	2 x 6.0Ah	2 x 4.0Ah	2 x 2.0Ah
Special Modes	2-in-1 trimmer/edger	2-in-1 trimmer/edger	4-in-1 multi-tool	2-in-1 trimmer/edger	2-in-1 + foldable shaft

In this article

1. WORX 20V 12″ 2-in-1
   1. WORX 20V 12" 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163 | Command Feed, Works for Lawn Weed Removal Tasks, 2 x 2.0Ah Batteries & Charger Included, PowerShare
2. Black+Decker 40V MAX 13 Inch
   1. 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)
3. WeGofly 13″ Electric Weed Wacker
4. HEYWORK 20V 12″ Cordless
   1. 20V 12.5 inch Cordless String Trimmer
5. KOMASTY 20V Electric Weed Wacker
   1. 20V Electric Cordless String Trimmer 2 x 2.0Ah Battery Powered with Charger | 12 Inch Lightweight Lawn Trimmer, 2-In-1 Trimmer & Edger with Auto Line Feed, Grass Cutter Lawn Mower for Small Yard Garden
6. How We Chose These Products
7. Buying Guide: What Really Matters
8. Our Top Recommendation
9. Frequently Asked Questions
   1. How long do battery trimmers actually last on a charge?
   2. Is it worth paying more for a brushless motor?
   3. Can I use metal blades on any battery trimmer?
   4. How should I store the battery to make it last?
10. The Verdict: Which One Should You Buy?

WORX 20V 12″ 2-in-1

The WORX WG163 is the trimmer you buy when you want one tool that handles both trimming and edging without forcing you to buy a separate attachment. It converts from a string trimmer into an edger in seconds, which sounds like a gimmick until you actually use it. The head tilts 90 degrees, so you can run it along a sidewalk or driveway and get a clean, straight line without crouching or fighting the tool’s angle.

What stands out here is the push-button line feed. Most trimmers in this price range make you bump the head on the ground to release more line, which wears the spool and interrupts your rhythm. With the WG163, you press a button on the handle and the line feeds instantly. That might not sound like a big deal, but when you’re halfway down a long fence line and the string snaps, the difference between a button press and a bump is real time saved. The rubberized wheels on the edger mode also guide the tool along the ground, keeping your edges straight even if your hands aren’t perfectly steady.

There are trade-offs. The 20V battery is fine for a typical suburban yard, but if you’ve got a large property with heavy weeds, you’ll likely need a second battery or a break to recharge. The cutting width of 12 inches is standard, not generous, so you’ll make more passes than you would with a 15-inch model. The line itself is thinner than what you’d find on heavier-duty trimmers, which means it struggles with really thick brush. For routine grass and light weeds, it’s excellent.

• 2-in-1 design converts from trimmer to edger without tools
• Push-button line feed gives instant line release mid-task
• Head tilts 90 degrees for slopes and tight spots
• Rubberized wheels guide straight edging lines
• Adjustable spacer guard protects plants and landscape features

Best for: Homeowners who want a simple, reliable 2-in-1 for regular lawn maintenance and crisp sidewalk edges without spending on a separate edger.

Black+Decker 40V MAX 13 Inch

The Black+Decker LST140C steps up the power with a 40V MAX battery, and you feel the difference the first time you cut through a patch of thick grass that stalls lesser trimmers. The high-torque PowerDrive transmission delivers cutting strength right at the string, so it chews through dense growth without bogging down. This is the model to grab if your yard has areas you’ve let go for a few weeks and need something that won’t quit.

The battery includes a charge indicator on the pack itself, which is one of those small features you appreciate more than you expect. You can glance at the tool and know whether you have enough juice to finish the back forty or if you need to swap batteries. The AFS automatic feed system also works as advertised. It releases new line automatically when the string wears short, so you’re not stopping constantly to tap the head. That keeps the workflow smooth, especially when you’re edging along a long driveway.

Nothing’s perfect, though. This unit is heavier than the 20V models, and the weight sits forward, which can fatigue your arms during longer sessions. The wall-mountable charging base is a nice touch for saving bench space, but it means you’re committed to mounting it somewhere. Conversion from trimmer to edger is quick, but the mechanism feels a little less solid than the WORX design. Availability can also be an issue, so check the listing carefully before ordering.

• 40V MAX lithium-ion battery with state of charge indicator
• High-torque PowerDrive transmission for dense grass
• Quick conversion between trimming and edging modes
• Automatic Feed System (AFS) supplies line without bumping
• Wall-mountable charging base saves workspace

Best for: Owners of medium to larger lawns who need extra torque to power through thick grass and want a battery platform with more headroom.

WeGofly 13″ Electric Weed Wacker

The WeGofly 4-in-1 is the Swiss Army knife of this group. It works as a string trimmer, lawn edger, mini lawn mower, and brush cutter, which means it can handle everything from a quick tidy-up around the mailbox to cutting down overgrown weeds along a back fence. The included metal blades and saw blades swap in for jobs that would destroy standard trimmer line, so you’re not limited to grass.

The headline feature here is the dual 21V 6.0Ah batteries. That’s a serious amount of runtime on paper, and in practice, it means you can finish most entire yards on a single charge cycle without swapping packs. The brushless motor spins at 15,000 RPM, which is faster than anything else on this list. That speed translates to cleaner cuts through thick growth, and the steel gear set means the head doesn’t jam when you hit something tougher than expected. For anyone with a yard that includes both maintained lawn and rough areas, this versatility is hard to beat.

But versatility comes with complexity. Switching between the different modes and blades takes some learning, and the instructions aren’t the clearest. The tool is lightweight at 5.2 pounds, which helps with fatigue, but the balance feels different when you attach the metal blades versus the trimmer head. It’s also the most expensive option here, so you’re paying for that multi-tool capability. If you only need a simple trimmer, you’re spending money on features you won’t use.

• 4-in-1 design: trimmer, edger, mini mower, brush cutter
• Three cutting options: line, metal blade, saw blade
• Dual 21V 6.0Ah batteries for extended runtime
• 15,000 RPM brushless motor with steel gears
• Adjustable cutting head and telescopic pole for height

Best for: Property owners with mixed terrain who want one tool that can trim, edge, mow small areas, and cut brush without buying separate machines.

HEYWORK 20V 12″ Cordless

The HEYWORK trimmer hits the sweet spot for anyone who wants a dependable cordless tool without paying a premium. It comes with two 20V 4.0Ah batteries, which gives you a solid chunk of runtime for a typical yard. The 8,000 RPM motor isn’t the fastest on the market, but it’s more than adequate for regular grass and light weeds, and it manages to do so without draining the battery as aggressively as higher-speed motors.

What makes this model stand out is the bundle. You get eight pre-wound replacement spools in the box, which means you won’t be hunting for line or struggling to wind a spool for a long time. That’s a practical consideration that many buyers overlook until they’re standing in the garage with tangled line and a half-finished yard. The auto-feed system also works reliably, releasing line when it wears short and saving you from the bump-and-pray routine.

The trade-off is power. At 20V, it won’t muscle through really thick brush or neglected meadows the way the 40V Black+Decker will. The 6.3-pound weight is manageable, and the adjustable grip helps with comfort, but taller users might find the shaft a bit short. It’s a trimmer for routine maintenance, not heavy reclamation projects. The customer service reputation is solid, which matters if you run into issues down the road.

• Two 20V 4.0Ah batteries for extended run sessions
• Auto line feed releases line when it wears short
• 8 pre-wound replacement spools included
• 6.3 pounds with adjustable comfortable grip
• 2-in-1 design for trimming and edging

Best for: Budget-conscious homeowners who want a reliable trimmer with spare batteries and a long-term supply of line included from day one.

KOMASTY 20V Electric Weed Wacker

The KOMASTY trimmer solves a problem most reviews ignore: storage. The shaft folds 180 degrees in three ways, so the whole tool collapses into a compact shape that fits vertically in a corner, an apartment closet, or a crowded garage. If you’ve ever wrestled a long-shafted trimmer into a shed packed with bikes and lawn chairs, you understand why this matters.

Beyond the clever folding design, this trimmer delivers respectable performance for small yards. The 9,500 RPM motor cuts through typical grass without strain, and the 12-inch cutting swath clears a decent path. The auto-feed system works as advertised, and the 90-degree adjustable head lets you reach under benches and along slopes without contorting your body. The 180-degree rotatable handle adds another layer of flexibility for cutting at awkward angles.

The honest limitation is runtime. Two 2.0Ah batteries provide about 30 minutes total of continuous power, which is fine for a small yard but won’t get you through a larger property. The instruction to let batteries cool before recharging is worth heeding, as it extends their lifespan. This is also not the tool for thick, dense grass. The manufacturer explicitly warns against cutting overly thick growth to prevent line breakage, so keep expectations realistic. For a small, tidy yard, it’s a clever, space-saving choice.

• Shaft folds 180 degrees for compact vertical storage
• 90-degree adjustable head for slopes and under benches
• 9,500 RPM motor for typical grass and light weeds
• Two 2.0Ah batteries provide about 30 minutes total runtime
• 2-in-1 pivoting head switches between trim and edge modes

Best for: Apartment dwellers or homeowners with small yards and tight storage spaces who need a lightweight, foldable trimmer that disappears when the job is done.

How We Chose These Products

We didn’t just read spec sheets. Each trimmer in this roundup went through the same battery of tests. We ran them on regular turf, let grass grow shaggy for two weeks, and tested edging along concrete driveways and brick borders. We timed how long each battery lasted under real cutting conditions, not just idle spinning. We also measured reload speed, swapping in fresh line and timing how long it took to get back to cutting.

The selection criteria centered on value, reliability, and real-world usability. We favored models with automatic or push-button line feed over bump-feed systems, because the time savings add up over a season. We weighed runtime against battery weight, and we considered the broader battery platform. A trimmer that shares batteries with other yard tools is worth more than one that locks you into a single-use system. These five earned their spots because they solve specific problems for specific buyers, not because they had the flashiest marketing.

Buying Guide: What Really Matters

Voltage gets all the attention, but it’s only part of the story. A 40V trimmer with a 2.0Ah battery might deliver less total runtime than a 20V model with a 6.0Ah pack. Amp-hours measure the battery’s fuel tank, while voltage measures the push. For typical residential trimming, 20V is sufficient. If you’re dealing with thick grass or want more headroom, stepping up to 40V makes sense, but check the amp-hour rating on the included battery before you assume you’re getting more run time. The battery string trimmer market is crowded, so understanding this relationship helps you compare honestly.

The line feed system matters more than most people think. Bump-feed heads require you to tap the spool on the ground, which works but interrupts your flow and can damage the head over time. Push-button and automatic systems feed line without stopping, which keeps you moving. The trade-off is that automatic systems can occasionally feed too much line, wasting string. Look for a model with a feed system that matches your patience level.

Shaft material and balance affect how your arms feel after an hour of work. A lightweight shaft with a rear-mounted motor balances better than a front-heavy design, reducing fatigue. If you’re over six feet tall, check the shaft length. A trimmer that’s too short forces you to hunch, which leads to back pain. Consider the weight distribution, not just the total weight. A well-balanced 7-pound trimmer feels lighter than a poorly balanced 5-pound one.

Our Top Recommendation

The Black+Decker LST140C takes the top spot for most homeowners. The 40V platform delivers the torque to handle anything a typical yard throws at it, the automatic line feed keeps you working, and the battery charge indicator removes the guesswork. It’s not the lightest option, but the power advantage justifies the extra weight for anyone with a medium to large lawn. The quick conversion to edging mode adds versatility without requiring a separate tool.

For budget buyers, the HEYWORK offers the best value with its dual batteries and eight spare spools. For those with heavy brush and varied terrain, the WeGofly’s multi-tool design and metal blade options make it the most capable single unit. The WORX remains the best pure 2-in-1 for edging precision, while the KOMASTY wins for apartment dwellers with its foldable shaft. If you’re building out a battery platform, check what other tools are available in the same voltage family. A trimmer that shares batteries with a lawn mower for small lawns or leaf blower is a smarter long-term investment.

Frequently Asked Questions

How long do battery trimmers actually last on a charge?

Real-world runtime depends heavily on grass density. Cutting thin, dry grass on a maintained lawn, a 4.0Ah battery might last 30 to 40 minutes. Cutting thick, damp grass can cut that in half. The advertised numbers usually come from idle tests with no cutting load. Plan for the worst case and buy a model with two batteries if you have a larger yard.

Is it worth paying more for a brushless motor?

Brushless motors are more efficient, which means longer runtime per charge and less heat buildup. They also tend to last longer because there are no brushes to wear out. For occasional trimming, a brushed motor is fine. If you use the trimmer weekly or have a big property, the premium for brushless is worth it.

Can I use metal blades on any battery trimmer?

No. Metal blades require a trimmer head designed to handle the stress and a motor with enough torque. Putting a metal blade on a trimmer rated only for line is dangerous. The WeGofly model here explicitly supports metal and saw blades, but most standard trimmers do not. Check the manual before attempting any blade swap.

How should I store the battery to make it last?

Store lithium-ion batteries at partial charge, around 50 to 60 percent, in a cool, dry place. Extreme heat degrades cells faster than anything else. Avoid leaving the battery on the charger after it’s full, and let a hot battery cool down before recharging. Following this routine extends the usable life to several years.

The Verdict: Which One Should You Buy?

Start with your lawn size and grass type. Small, tidy yard with tight storage? The KOMASTY’s folding shaft solves a real problem. Budget matters most? The HEYWORK delivers solid performance with spare batteries and line included. Heavy weeds and varied terrain? The WeGofly’s blades and dual large batteries handle more than any string trimmer should. Edging precision along sidewalks and flower beds? The WORX’s wheeled edger mode is the most controlled of the group.

For the majority of homeowners, the Black+Decker LST140C is the pick. It balances power, runtime, and convenience in a way that fits the broadest range of yards. It doesn’t have the flashiest features, but it does the job without drama. Check the current price on Amazon and see if the 40V platform fits your future tool needs. If you already own other cordless yard tools, look for a trimmer that shares that same battery system to avoid juggling multiple chargers and packs. The right choice comes down to your specific yard, but any of these five will retire your gas can or extension cord for good.