Top 8 Best Battery String Trimmer Reviews and Buying Guide

The battery-powered lawn care essentials, such as string trimmers (aka weed whippers), are becoming more popular every year. This is partially because they are convenient and eco-friendly, but they also save you time, work, and money and help you maintain your home’s curb appeal. However, when you are in the market for a battery-operated lawn trimming tool, things can get confusing quickly. There are many options to choose from—but at the end of the day there’s no doubt that a professional-grade product is sure to last a long time.

In our comprehensive buyer’s guide, we’ll help you decide if Battery string trimmer is the best option for you and give tips on choosing the right model.

Editor’s Pick-Battery String Trimmer

# Preview Product Score
1 BLACK+DECKER 20V Max String Trimmer/Edger, 12-Inch (LSTE525)

BLACK+DECKER 20V Max String Trimmer/Edger, 12-Inch (LSTE525)

9.4
2 EGO Power+ ST1502SA 15-Inch Weed Eater 56-Volt Cordless String Trimmer with Rapid Reload and Split Shaft Weed Wacker 2.5Ah Battery and Charger Included, Black

EGO Power+ ST1502SA 15-Inch Weed Eater 56-Volt Cordless String Trimmer with Rapid Reload and Split...

9.7
3 RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer, 4.0 Ah Battery and Charger Inc

RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer, 4.0 Ah Battery and Charger Inc

9.8
4 Makita XRU15PT1 36V (18V X2) LXT Brushless String Trimmer Kit with 4 Batteries (5.0Ah)

Makita XRU15PT1 36V (18V X2) LXT Brushless String Trimmer Kit with 4 Batteries (5.0Ah)

9.4
5 Greenworks 40V Cordless String Trimmer and Leaf Blower Combo Kit, 2.0Ah Battery and Charger Included

Greenworks 40V Cordless String Trimmer and Leaf Blower Combo Kit, 2.0Ah Battery and Charger Included

9.5

Best Battery String Trimmer In 2022

1. Worx WG163 GT 3.0 20V PowerShare 12″ Cordless String Trimmer

Sale

Worx WG163 GT 3.0 20V PowerShare 12" Cordless String Trimmer & Edger (Battery & Charger Included)

  • [TRIMMER & EDGER 2-in-1] Easily converts from a string trimmer to a wheel edger in just seconds
  • [INCLUDES] 20V Trimmer & Edger, (2) 20V MaxLithium Battery, 20V Charger, Trimmer Spool, Support Wheels, Safety Guard
  • [DO IT ALL WITH THE SAME BATTERY] Worx Power Share is compatible with all Worx 20v and 40v tools, outdoor power and lifestyle products
  • [RUBBERIZED WHEELS] Support and guide the edger, giving you straighter lines and cleaner cuts
  • [HEAD TILTS 90°] So you can trim and edge on sloped terrain, and get to tough-to-reach places

The 2-in-1 GT quickly converts from a trimmer to an in-line wheeled edger and back again. Save your money and don’t buy a separate trimmer and edger. The Command Feed spool system gives you line when you want it at the press of a button. And press all you want because the GT comes with Free Spools for Life! The rubberized wheels provide traction and support for even, professional looking lines when you’re edging. The head tilts 90° so you can trim on uneven patches of lawn.

The adjustable spacer guard keeps protects the tops of flowers and plants. And at only 5.3 lbs. you can get your trimming and edging done without feeling fatigue from it. Two powerful 20V Power Share batteries are included with this purchase, which you can use on any tool on the WORX Power Share platform.

Spacer Guard

Protect flowers, plants, and lawn furniture from accidental trimming. The adjustable guard is your best friend when it comes to keeping the decorative parts of your landscaping safe

Trim Hard to Reach Places

The head tilts a full 90° so you can trim in tight, awkward spaces, or so you can edge in uneven terrain. The handle is fully adjustable as well, so you can find a position that’s comfortable to work in.

2. BLACK+DECKER 20V MAX String Trimmer, 2-Speed

BLACK+DECKER 20V MAX String Trimmer, 2-Speed, 12-Inch, Cordless (LST522)

  • Easily converts from trimmer to wheeled edger.
  • Maximum initial battery voltage (measured without a workload) is 20. Nominal voltage is 18V.
  • LBXR2520 battery provides cordless grass trimmer 66% more battery capacity for longer runtime compared to LBXR20
  • Automatic Feed Spool (AFS) feeds edger/ trimmer line as needed - without bumping.
  • PowerDrive Transmission increases torque for more cutting power at the string.

Designed with your convenience in mind, this cordless string trimmer easily converts into an edger, while the AFS AUTOMATIC FEED SPOOL lets you keep working without bumping. With a 2-speed control function, you can adjust the power output to suit the task, and the POWERDRIVE transmission enhances the string power and cutting action, even when faced with tough-to-manage weeds and grasses.

2in1 design

Easily converts for use as a cordless trimmer or wheeled edge trimmer, so you can maintain side-walks, driveway edges, decks, and walkways.

Afs Automatic Feed Spool

Eliminates constant stopping and starting while trimming by smoothly feeding trimmer line with no bumping required.

2-speed Control

Lets you boost power or increase runtime. Choose the lower speed for jobs that require more time and the higher speed for jobs that need added power.

POWERDRIVE transmission

For ultra-powerful torque and cutting action. Cover more ground in less time

3. Greenworks 40V 12″ Cordless String Trimmer, 4.0Ah Battery and Charger Included

Greenworks 40V 12" Cordless String Trimmer, 4.0Ah Battery and Charger Included

  • Battery completely charges in 120 minutes
  • Includes 40V 12 inch String Trimmer, Auxiliary Handle, Guard, Edge Guide, Bonus Spool, Bonus Spool Cover, 4.0 Ah Battery, Battery Charger, Operator's Manual
  • Up to 60 minutes of runtime on a fully charged battery
  • Ergonomic design for superior balance
  • 12 inch cutting path with 0.065 inch dual line auto feed head for quick and easy line advancement

The Greenworks 40-Volt 12-Inch Cordless String Trimmer Kit – 2103002 is a lightweight and powerful battery-operated lawn tool that cuts smooth edges and precise lines. This electric yard tool requires no gas or heavy power cords. An integrated string spool allows for less tangles and mess when trimming, while the instant-start trigger gun quickly releases more line when needed. For convenience and ease of use, this trimmer also comes with a shoulder strap for added comfort while working.

Fully Charged Battery

This 40V 12″ string trimmer offers up to 60 minutes of runtime on a fully charged battery, and provides a 12 in cutting path with 0.065 inch dual line auto feed head for quick and easy line advancement. A low noise level reduces vibration and soft start technology allows the engine to power up gradually without sudden surges of power. Ideal for yards up to 1/3 Acre, this tool is equipped with adjustable spindle locks that save time when switching between trimming a flat surface or edging along pavement.

Lithium-ion Battery

Cordless convenience a 12″ cutting swath and a 4.0Ah battery delivers the same power as gas trimmers but without the hassle of fuel, cords or fumes. Greenworks 40V Cordless String Trimmer powered by a 40V 4Ah Lithium-ion battery offers up over an hour of runtime per charge and recharges for 120 minutes so you won’t have to wait for it to charge before getting back to work!

4. BLACK+DECKER 40V MAX* String Trimmer / Edger

BLACK+DECKER 40V MAX* String Trimmer / Edger, 13-Inch (LST140C)

  • Power drive high-torque transmission gives you cutting power at the string for clean, fast cuts. Nominal voltage is 36.
  • Automatic feed Spool - afs which automatically feeds trimmer line as needed with no bumping
  • High-performance 40V max Lithium ion Battery with state of charge indicator that shows remaining power
  • Converts from trimmer to edger in seconds

Seamlessly switch between trimming and edging with this cordless 2in1 tool. It’s designed with an AFS AUTOMATIC FEED SPOOL that keeps things running smoothly—there’s no need to bump it like other lawn trimmers. The high-torque POWERDRIVE Transmission delivers powerful cuts, so you can get the job done in less time with less muscle.

2in1 Design

Easily converts for use as a trimmer or edge trimmer.

Afs Automatic Feed Spool

Eliminates constant stopping and starting while trimming by smoothly feeding trimmer line with no bumping required.

POWERDRIVE Transmission

For ultra-powerful torque and cutting action. Cover more ground in less time.

5. DEWALT FLEXVOLT 60V MAX* String Trimmer, Brushless

DEWALT FLEXVOLT 60V MAX* String Trimmer, Brushless, Two Speed, 15-Inch, 3-Ah Battery (DCST970X1)

  • Gear drive design of the edger/trimmer powers through tough overgrowth
  • Variable speed trigger with Hi/Lo speed control for added power or extended run time
  • Lightweight and ergonomic design maximizes control and minimizes stress on your arms
  • Designed to withstand everyday heavy-duty usage
  • High-efficiency brushless motor of the cordless grass trimmer maximizes run time and motor life

The DEWALT FLEXVOLT 60V MAX* String Trimmer is designed to power through tough overgrowth and withstand everyday heavy-duty usage. Ideal for edging, trimming and clearing overgrown areas, this high-efficiency brushless string trimmer features a lightweight and ergonomic design and the capability to be used with either 20V MAX or 60V MAX* batteries.

High-efficiency Brushless Motor

The DEWALT 60V MAX* Flexvolt string trimmer/edger features a high-efficiency brushless motor and gear drive for powerful performance to cut through tough overgrowth. The brushless motor provides longer run time and endurance on a single charge, while the universal shaft makes switching attachments effortless.

Trimming And Edging Angles

With the pivoting head, you can easily control all trimming and edging angles, making it ideal for use on sidewalks, driveways, deck borders and more. The trimmer’s battery charges in less than an hour with the DCB134 charger (sold separately) so you can spend less time waiting around and more time trimming your grass or weeds.

6. BLACK+DECKER 20V MAX String Trimmer/Edger Kit

Sale

BLACK+DECKER 20V MAX String Trimmer/Edger Kit, 10-Inch (LST201)

  • Adjustable height and handle for ideal user comfort
  • Automatic Feed Spool (AFS) automatically feeds trimmer line
  • Included Components: (1) LST200 20V MAX 10" Trimmer, (1) LBXR20 20V MAX Lithium Battery, (1) Charger, (1) Guard, (1) AFS Spool; Power Source: Lithium Ion
  • 20V MAX Lithium Ion 1.5Ah battery holds it's charge for up to 18 months
  • Part of the 20V MAX System; 1 System - Endless Tasks. Power for your Style

Keep your yard impeccably maintained with the 2in1 Cordless String Trimmer/Edger. Thanks to its lightweight, adjustable design and AFS AUTOMATIC FEED SPOOL that smoothly feeds line without any bumping, this versatile string trimmer and edge trimmer combo provides complete convenience and premium performance in one perfect package.

2in1 Design

Easily converts for use as a cordless string trimmer or wheeled edge trimmer.

AFS AUTOMATIC FEED SPOOL

Eliminates constant stopping and starting while trimming by smoothly feeding trimmer line with no bumping required.

Adjustable Height and Handle

Offers convenient, customizable comfort.

7. RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer

Sale

RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer, 4.0 Ah Battery and Charger Inc

  • Attachment capable: accepts RYOBI expand-it attachments and other universal gas attachments to save time, money and space
  • Reel-easy bump-feed string head for fast and easy reloading
  • 13 in. to 15 in. adjustable cutting width for longer run time or wider cutting path
  • 40-Volt lithium-ion high capacity battery and 90-minutes charger included
  • Variable speed trigger for cutting control

Gas-like power you want, attachment capability you need. The RYOBI 40-Volt X Expand-it Trimmer delivers power like a gas trimmer, with none of the hassle of mixing oil and gas. Attachment capability means you can add on RYOBI Expand-It attachments, saving you time, money and space. The RYOBI 40-Volt X Expand-It Cordless Trimmer comes with premium 0.080 in. twisted line and the REEL-EASY bump-feed string head for faster reloads, usually found only on gas trimmers. The cutting width is adjustable for longer run time or wider cutting width. This trimmer is recommended for yards up to 1-Acre.

Capable String Trimmer

RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer – Attachment capable: accepts RYOBI expand-it attachments and other universal gas attachments to save time, money and space. This powerful trimmer delivers 22 inch cutting swath to tackle taller grass in tight spaces. Features an ergonomic handle that adjusts for different heights for comfort when you are tall or short. 

Yard Quick And Easy

Ryobi’s 40-Volt Lithium-Ion Cordless Attachment Capable String Trimmer makes cleaning up your yard quick and easy. With the 13 in. to 15 in. adjustable cutting width, you can clean more grass with less passes. With its 90-minutes charger and high capacity battery you can get more done in less time.

8. Kobalt 80-Volt Max 16-in Straight Cordless String Trimmer

Kobalt 80-Volt Max 16-in Straight Cordless String Trimmer (Battery Included)

  • Kobalt 80-volt cordless string trimmer provides the power you need with up to 60 minutes runtime on a fully charged 2.5 Ah battery (battery and charger included)
  • Comes with premium 0.08-in line on the spool, along with an extra spool of 0.095-in line
  • Easy-to-use rapid reload head feeds additional line with just a tap
  • Brushless motor delivers more power and torque to help cut through the thickest of grasses
  • Adjustable cutting width lets you select either 14-in or 16-in for quicker cutting

What do you get when the best gets even better? Kobalt’s robust lineup of second-generation 80V battery-operated yard tools boast bigger batteries to help tackle even tougher jobs. You don’t slow down, and neither do we. Larger batteries mean longer runtimes, even more power and a host of technological and design upgrades that deliver unmatched performance. No matter what your list includes, our exceptional new line helps you master it.

Easy-to-use Rapid Reload

Kobalt 80-volt cordless string trimmer provides the power you need with up to 60 minutes runtime on a fully charged 2.5 Ah battery (battery and charger included) Adjustable cutting width lets you select either 14-in or 16-in for quicker cutting Brushless motor delivers more power and torque to help cut through the thickest of grasses Easy-to-use rapid reload head feeds additional line with just a tap Comes with premium 0.08-in line on the spool, along with an extra spool of 0.095-in line Battery on-board indicator helps you monitor remaining battery charge Hi/lo speed selection allows for greater control, giving you the right amount of power for the right circumstance 2.5 Ah battery and charger included.

Cordless String Trimmer With Brushless

The new Kobalt 80-Volt Max 16-in Straight Cordless String Trimmer with Brushless Motor delivers more power and torque to help cut through the thickest of grasses. With up to 50 percent more runtime, you can finish your yard jobs faster than ever before. The 6.0Ah battery is compatible with all tools in the Kobalt Cordless system, allowing for maximum productivity when tackling larger projects.

Best Battery String Trimmer Buying Guide

 battery line trimmer

Cutting Ability

Cutting power is determined by three factors: line speed, line thickness/mass, and motor torque.

The better the tips cut grass, the faster the line whips around. In this category, most battery-powered string trimmers are suitable. You should be fine as long as you’re getting at least 5000 RPM. The highest models can reach 6500 RPM, and higher rotational speeds make a considerable difference in how quickly you can perform your trimming tasks.

Moving on to line thickness, the larger the line mass, the more force it can use to cut through thicker grass. It’s the difference between being hit at the same time by a 175-pound safety and a 225-pound linebacker. Cutting power increases as mass increases.

Most cordless string trimmers require at least 0.080-inch line. For the best overall performance, we recommend 0.095-inch. If you have tougher grass or routinely deal with overgrowth, a string trimmer with 0.105-inch line will help you get more done. Remember that line diameter has a direct impact on runtime—a thicker line requires more electricity to run.

Finally, a higher torque motor prevents the trimmer from slowing down as the going gets tougher. Grass pushes back against the line, causing it to bend back and finally bogging the motor, even though it appears to be a low-demand operation. Even when its peak RPMs are lower than low-torque gearing, higher torque holding maintains the head spinning better in severe cutting scenarios.

Swath Cutting

A large cutting swath allows you to clean vast areas faster or provides your mower a more generous border. However, running wider requires more power, therefore runtime is always a factor. However, in recent years, we’ve seen technology come together to provide us with solid possibilities. In most cases, a 15-inch cutting diameter will suffice. When you need to cut larger areas, the new 16- and 17-inch versions are ideal.

Runtime

Trimming takes roughly 15 minutes of continuous trigger time for the average homeowner on a 1/4-acre lot. Most cordless string trimmers will be able to reach that pace without difficulty.

Professional lawn care staff, on the other hand, require far more. Homeowners with vast holdings and farm/ranch property have similar concerns.

If you need more runtime, search for a string trimmer that combines the efficiency of a brushless motor with the use of 0.095-inch line and maybe a larger battery. Of course, you may always bring extra batteries with you.

Also, when the grass isn’t as thick, learn how to trim at a modest speed. Even if you have to slow down a little, you will cut a much larger area.

Vibration

Low-vibration string trimmers are really important to us. We already have enough on our plates managing the weight of such a long tool without adding vibration to the mix. Some of today’s versions have such good harmonics that very little vibration makes it up the handle… They’re also a lot of fun to use!

Balance and Weight

You want the lightest weight you can obtain without sacrificing the power you require if you’re working all day on a lawn crew or just putting the final touches on your own lawn. The battery can add a lot to the overall weight. It’s a major gain if you can find a fully loaded battery-powered string trimmer that matches your performance needs and weighs less than 10 pounds.

Balance is important, and the best trimmers have the motor mounted on the trimmer head to balance off the battery weight on the back. You may also change the front handle on many models to fine-tune your fit.

If you want an attachment-capable model, you’ll have to put the motor in the back, which changes the balance back. Consider adding a shoulder strap to accommodate those and trimmers who are simply heavier by nature.

Sound Volume

One of the key advantages of switching away from gas power is less noise. The decibel levels of the cordless string trimmers we examined varied from the low 80s to the upper 90s (measured at our operator’s ear). Even at the highest setting, it outperforms the bulk of gas trimmers.

On electric trimmers, line selection is more important than on gas trimmers. Changing the line you’re using can sometimes lower overall noise or adjust the tone to a less unpleasant frequency.

Line Alterations

Changing the line can be either a simple or a frustrating procedure. Although certain trimmers still have manual heads, manual loading is mainly obsolete. Look for models that offer a fast-loading system to make the job easier (SpeedFeed, Rapid Load, etc). Thread the line through the head to the middle, turn the head to load it, and go about your business.

You can upgrade most trimmers to a quick-load head regardless of what comes standard.

EGO’s PowerLoad design is currently the best on the market. It combines the fast-load principle with automatic winding to provide the easiest and fastest line changes we’ve ever experienced.

Capability of Attachment

String trimming, edging, and hedge trimming are normally done by professional lawn staff, but homeowners can save a lot of money by purchasing interchangeable heads and tools that cover everything from blowing to brush cutting.

Attachment systems, as previously stated, require a top-mounted motor that impacts the balance. You must make a trade-off for the convenience you obtain.

The attachment connection style is something to keep in mind. Models with a “universal” connector can employ attachments from other manufacturers, giving them a far wider range of options. Recent multi-head systems from EGO, Milwaukee, and Stihl are incompatible with others, so make sure they have everything you need before purchasing cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval cheval

Frequently Asked Question

How Long Does A 2ah Battery Last On A Trimmer?

Load and tool influence how long a battery can be expected to last. In optimum conditions, the 14-inch string trimmer’s 2.0Ah battery can last up to 25 minutes. When using an attachment, this number will change.

Are Ego Trimmers Any Good?

The Verdict. The EGO 56V Powerload string trimmer now ranks as one of the best we’ve evaluated for the average home user. All of these characteristics come together in a single package, thanks to the lightweight carbon fiber shaft.

What Is A Brushless Trimmer?

While a brushless motor tool adapts its speed, torque, and power supply based on the resistance of the task or substance you’re working with, a brushed motor tool uses the same amount of power regardless of the resistance it encounters.

How Thick A Branch Can A Hedge Trimmer Cut?

As long as you don’t have a lot of thick branches to deal with, a gas, electric or battery-powered hedge trimmer will do the trick. The trimmer’s teeth could get clogged with anything larger, therefore thicker branches should be removed with a chainsaw or a more powerful hedge cutter.

Should You Oil Hedge Trimmer Blades?

Whether or not hedge trimmers require oil is a common question. Yes, hedge trimmers require oil in order to avoid the blades from overheating, which can cause the blades to bend. Hedge trimmers, in contrast to chainsaws, lack an oil reservoir, therefore oil is sprayed straight onto the blades.

Conclusion

Although they are not the most powerful string trimmers, they can handle small to medium-sized lawns. We recommend the EGO Power+ 20-volt to homeowners who want something reliable that doesn’t need too much maintenance. It’s also lighter than many other options and balances very well, making it easy to use.

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