5 Best Cordless Grass String Trimmer: Top Picks and Buying Guide

Finding the best cordless grass string trimmer depends on more than cutting width. Battery capacity, line-feeding design, edging control, comfort, and compatibility with other tools all affect how easily you can finish routine yard work. For most homeowners, a cordless model is quieter and simpler to start than a gas trimmer, while still providing enough power for grass, weeds, and lawn edges.

Among these five options, the 13″ Electric Weed Wacker is the primary recommendation because it combines a wide cutting path, two high-capacity batteries, multiple cutting attachments, and a brushless motor. The WORX 20V 12″ 2-in-1 Cordless String Trimmer is the clear alternative for shoppers who value a mature battery platform, convenient edging guidance, and a more focused trim-and-edge design.

This roundup compares the products by cutting versatility, battery setup, power and runtime details, handling, line management, edging features, storage, and the practical limitations described in the available product information. The ranking is intended to help you match the trimmer to your yard rather than simply choose the model with the largest number.

Best Cordless Grass String Trimmer at a Glance

1. 13″ Electric Weed Wacker

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The 13″ Electric Weed Wacker earns the top position by offering the broadest combination of capability and included equipment. It is not only a string trimmer and edger; its 4-in-1 design also supports mini lawn-mower and brush-cutter duties. That flexibility is useful for homeowners who want one cordless tool for grass borders, overgrown weeds, and small shrubs instead of keeping several specialty tools in the shed.

Its cutting system is especially versatile. Users can switch among trimmer line, metal blades, and saw blades for different types of vegetation. The 13-inch cutting width should help cover open areas efficiently, while the adjustable head and telescoping pole make it easier to work around slopes, corners, and awkward spaces. At a stated 5.2 pounds, it is also positioned as a relatively lightweight choice despite its expanded functions.

Power comes from a 15,000-RPM brushless motor and steel gear set. The supplied data describes the system as designed to reduce jamming and resist motor burnout, which may appeal to people who regularly deal with heavier weeds rather than only touch up lawn edges. Two 21V 6.0Ah batteries and a matched charger are included, reducing the need to stop midway through a larger trimming session.

The trade-off is complexity: more attachments mean more setup decisions, and a multi-function tool may be more capability than a small, regularly maintained lawn requires. The cutting attachments also require careful installation and use appropriate protection. The package includes replacement blades, trimmer line, a storage bag, and installation tools, so setup is intended to be straightforward. A three-year main-tool warranty and two-year battery warranty add useful ownership support. Choose another model if you want an established ecosystem or only need simple edging.

2. WORX 20V 12″ 2-in-1 Cordless String Trimmer

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The WORX 20V 12″ 2-in-1 Cordless String Trimmer ranks second because it focuses on the two tasks most homeowners actually perform: trimming grass and creating clean lawn edges. Its shaft converts from trimmer to edger in seconds, and rubberized support wheels help guide the tool along a border. That wheel support can make straight edging easier than trying to maintain the correct angle by hand.

This model also has several thoughtful handling features. The head tilts through 90 degrees, which helps when working on sloped ground or reaching beneath obstacles. An adjustable spacer guard protects plants, landscape features, and ornaments from accidental contact. At a stated 5.5 pounds, with a 12-inch cutting diameter, it should be manageable for ordinary residential maintenance without feeling excessively bulky.

Line management is another strength. The push-button command-feed spool lets the user release line when needed without bumping the head against the ground. The package includes two 20V Power Share MaxLithium batteries, and those batteries can be used with other tools in the WORX Power Share family. That compatibility can be valuable if you already own compatible WORX equipment or expect to add more cordless yard tools later.

The main limitation is that this is a dedicated trim-and-edge tool rather than a brush cutter or multi-attachment system. Its listed 7,600-RPM no-load speed and 0.065-inch line are well suited to routine grass and weed maintenance, but the product is not presented as a heavy brush-clearing machine. The included kit contains the trimmer, batteries, charger, spool, support wheels, and safety guard. Use the wheel and spacer features to improve control, and consider this model over rank one when simple edging and battery-platform compatibility matter more than cutting attachments.

3. BLACK+DECKER 20V MAX String Trimmer and Edger

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The BLACK+DECKER 20V MAX String Trimmer and Edger holds third place as a practical, familiar-style cordless option with a strong focus on simple operation. It converts from trimming to edging in seconds, making it appropriate for homeowners who want a single tool for maintaining grass around walkways, driveways, garden beds, and fences without dealing with a gas engine or separate edger.

Its POWERDRIVE transmission is designed to transfer more motor power to the cutting string, while the listed motor speed reaches 6,200 RPM. The automatic feed spool is a particularly convenient feature because it advances line when needed without the user having to bump the trimmer head. That can make routine work less interrupted, although automatic-feed systems still require the correct spool and line setup.

The tool includes one 20V MAX 2.0Ah lithium-ion battery. The supplied information describes that battery as providing 33% more runtime per battery pack than the company’s previous LBXR20 battery pack. A wall-mountable charging base gives the charger a fixed storage location, which is useful in a garage or utility area. The adjustable handle and height positions also support a more comfortable stance for different users.

This model’s trade-off is its single, relatively modest-capacity battery compared with packages that include two batteries or larger capacities. It is therefore more naturally suited to small and medium trimming jobs, or to owners who already have additional compatible batteries. Its 12-inch cutting swath is narrower than the 13-inch choices, but that can make it easier to control around plants and tight borders. Keep the automatic-feed spool correctly installed, charge the battery on its base, and select this trimmer when straightforward trim-and-edge work and ergonomic adjustability are more important than maximum runtime or brush-cutting versatility.

4. 20V Electric Cordless String Trimmer 2 X

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The 20V Electric Cordless String Trimmer 2 X is a space-conscious choice for smaller yards, apartments, and garages where storage matters nearly as much as cutting performance. Its shaft folds 180 degrees in three ways for vertical storage, helping it fit into tight corners. The handle rotates 180 degrees, and the head adjusts through 90 degrees, giving the user several ways to approach slopes, under-bench areas, and hard-to-reach corners.

For basic lawn care, the tool offers a 12-inch cutting swath and a stated 9,500-RPM motor. The 2-in-1 design switches between trimming and edging by pivoting the head, so users do not need a separate edging tool for ordinary border work. An automatic line-feed system dispenses cord as needed, eliminating the need for manual bumping during normal operation.

The package includes two 2.0Ah batteries and a charger. The supplied information estimates up to 30 minutes of total continuous power from the two batteries, which can cover many small-yard jobs but may require careful planning for larger properties or dense growth. The product instructions also indicate that, if the cord breaks, the user should release the trigger and then press and hold the safety lock and switch simultaneously to reactivate the tool.

Its limitations are important to understand. The product is described for small yards and tight spaces, and the batteries are considerably smaller in capacity than those included with the top-ranked model. The maker also cautions against cutting excessively thick or dense material. Let the batteries cool for a few minutes after use, keep the cutting head parallel to the ground during trimming, and fold the shaft only after the tool is safely stopped. This is a good fit when compact storage and maneuverability outweigh the need for long runtime or heavy-duty vegetation clearing.

5. BLACK+DECKER 40V MAX 13 in String Trimmer

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The BLACK+DECKER 40V MAX 13 in String Trimmer takes fifth place while offering a useful step up in battery voltage and a thoughtful way to balance power against runtime. Its PowerCommand dial lets the user select maximum power for thicker weeds or maximum runtime for longer stretches of ordinary grass. That adjustment is more practical than running every task at full output, especially when the yard includes both light edging and heavier overgrowth.

The POWERDRIVE transmission is designed to send more motor power to the cutting string, and the tool operates at speeds up to 8,500 RPM. Its 13-inch cutting width is broad enough for efficient coverage, while the automatic feed spool supplies line as needed without bumping. As with other automatic-feed models, keeping the spool and line properly installed is important for consistent operation.

This package includes a 40V MAX lithium-ion battery with a state-of-charge indicator, so users can check remaining charge rather than guessing when the job may end. The included fast charger restores full battery power in two hours or less according to the supplied information. The tool also converts from trimmer to edger in seconds and includes an adjustable telescoping pole and soft-grip handle for height and comfort adjustments.

The trade-off is that it is less versatile than the multi-function top pick and does not offer the WORX battery-family compatibility described for rank two. Its single-battery setup may also be less convenient for extensive properties if a spare is not available. Still, the power dial, charge indicator, automatic feed, and 13-inch swath make it a sensible choice for owners who want a stronger dedicated trimmer-edger. Adjust the power setting to the vegetation, charge the battery with the included fast charger, and use the telescoping pole to maintain a neutral working posture.

How to Choose the Best Cordless Grass String Trimmer

The right cordless trimmer should match the size of the property, the type of vegetation, and the way you prefer to maintain equipment. A tool that is excellent for weekly lawn edging may be frustrating when asked to clear tall, woody weeds. Conversely, a brush-capable model can be unnecessarily complicated for someone who only needs to tidy a small suburban lawn.

Start with the work you actually need to do

String trimmers are primarily finishing tools. They clean grass that a mower cannot reach and sharpen the appearance of borders around sidewalks, fences, beds, and structures. If that describes your work, a conventional 2-in-1 trimmer-edger is usually the simplest choice. The WORX and both BLACK+DECKER options are built around this kind of maintenance.

Some yards need more than line trimming. Dense weeds, small shrubs, and neglected corners may call for metal or saw blades, provided the tool is designed and equipped for those attachments. The 13″ Electric Weed Wacker is the only product in this group explicitly supplied as a 4-in-1 tool with trimmer line, metal blades, and saw blades. That makes it more adaptable, but attachments also add setup and safety responsibilities.

Think about frequency as well as intensity. A larger yard with light grass may require more total runtime than a small yard with occasional thick weeds. A compact model can be entirely adequate when used often, because regular maintenance prevents vegetation from becoming difficult to cut.

Understand battery capacity and runtime

Voltage alone does not tell you how long a trimmer will run. Battery capacity, usually expressed in amp-hours, is also important, as are the cutting conditions and power setting. The 13″ Electric Weed Wacker includes two 21V 6.0Ah batteries, which is the most generous stated battery capacity among these products. The WORX package includes two 20V batteries, but the supplied information does not state their amp-hour rating. The 20V Electric Cordless String Trimmer 2 X includes two 2.0Ah batteries and states up to 30 minutes of total continuous power.

The BLACK+DECKER 20V model includes one 2.0Ah battery, while the 40V model includes one 40V battery and a charge indicator. A single battery keeps the package simpler, but a spare may be valuable if you need to work continuously. Before buying, check whether the battery is proprietary, whether replacements are readily available, and whether the same battery can power other tools you own.

Runtime estimates should be treated as planning guidance rather than a guarantee. Thick weeds, long grass, frequent stops, maximum-power settings, and heavy line engagement can use energy faster than light edging. If possible, begin with a fully charged battery, keep a spare available for larger jobs, and avoid storing lithium-ion batteries in extreme heat or cold.

Choose a battery ecosystem carefully

Battery compatibility can lower long-term ownership costs, but only when the voltage and platform genuinely match. The WORX trimmer specifically uses the WORX Power Share family, which gives existing owners a clear expansion path. A compatible spare battery can also make a compact trimmer more practical for larger work.

Do not assume that batteries from different brands or even different product families can be interchanged. A charger should be matched to the battery system specified by the manufacturer. If you are starting from scratch, compare the other cordless tools you may eventually buy: mower, blower, hedge trimmer, and drills can all influence which platform is most useful.

Included batteries add immediate value because the tool is ready to use, but they also determine the initial runtime. A package with two smaller batteries may be more convenient than one battery for continuous work, even if the total capacity is not higher. Conversely, a single larger battery may be easier to store and monitor.

Compare cutting width and line behavior

Cutting width affects how many passes are needed. The 13-inch options can cover a little more ground per sweep than the 12-inch models, which is helpful along long borders or open lawn edges. A narrower swath can be easier to control around delicate plants, narrow paths, and crowded garden beds.

Line diameter and feed design also affect the experience. The WORX model lists 0.065-inch line and uses a push-button command-feed spool. The BLACK+DECKER 20V model and the 40V model use automatic feed systems, while the compact 20V trimmer also provides automatic line feed. Automatic systems reduce the need to bump the head, but they may use line differently from a manual system and require correct spool installation.

Keep a replacement spool or the recommended replacement line available before the original runs out. If the line repeatedly fails to feed, stop the tool, remove the battery, and inspect the spool for tangles, incorrect winding, debris, or a damaged cover. Never try to clear the head while the battery is connected.

Look for control and adjustment features

Ergonomics matter because trimming involves repeated sweeping motions and often awkward positions. Adjustable shafts help users of different heights maintain better posture. Adjustable handles can improve balance, particularly when the cutting head is near a wall or sloped edge. Soft-grip surfaces may reduce discomfort during longer sessions.

Tilting heads are useful under benches, along slopes, and around low obstacles. The WORX head tilts 90 degrees, while the compact 20V model combines a 90-degree adjustable head with a rotating handle. Wheels can provide a visual and physical guide during edging, as seen on the WORX model. A spacer guard can also prevent accidental contact with flowers, ornaments, and landscape borders.

Comfort does not mean ignoring technique. Keep the tool balanced, maintain a controlled sweep, and avoid reaching so far that the shaft pulls you off balance. If the trimmer feels awkward, adjust the shaft or handle before continuing rather than compensating with excessive wrist movement.

Decide whether compact storage is a priority

Storage design can determine whether a tool is convenient enough to use regularly. The 20V Electric Cordless String Trimmer 2 X folds its shaft in three ways for vertical storage, making it especially suitable for apartments, small garages, or crowded sheds. Other models may require more horizontal wall or floor space, although the BLACK+DECKER 20V package includes a wall-mountable charging base.

Store the trimmer with the battery removed and the cutting head protected from damage. Keep blades, spools, chargers, and small installation parts together so the tool is ready for the next job. If a model includes several cutting attachments, a supplied storage bag can help prevent parts from being misplaced.

Use the correct attachment and technique

Line is generally appropriate for grass and ordinary soft weeds. Metal or saw blades, where supplied and approved, are intended for tougher vegetation and require more caution. Install the attachment exactly as instructed and confirm that it is secure before starting. Do not improvise blades, line sizes, or adapters.

For edging, use the tool’s intended conversion method rather than twisting the shaft beyond its adjustment range. Wheel-guided edging can help produce a straighter border, while a pivoting head may be more useful when borders vary in height or shape. Keep the cutting head away from gravel, wire, stones, and hard landscape materials that can damage line or create dangerous debris.

Plan basic maintenance

After each use, remove grass and soil from the guard, cutting head, ventilation areas, and shaft. Inspect the line, spool, blades, fasteners, and safety guard before the next session. Replace worn or damaged components with the specified parts. A clean head is less likely to bind, and a clear guard helps preserve the intended cutting pattern.

Recharge batteries according to the manufacturer’s instructions and allow hot batteries to cool before charging when directed. Do not use a battery that is swollen, cracked, leaking, or visibly damaged. Keep contacts dry and clean, and store batteries away from loose metal objects that could bridge the terminals.

Brushless motors and steel gears can reduce some wear concerns, but they do not make a trimmer maintenance-free. Avoid forcing the head into vegetation beyond the model’s intended capacity. If the motor stalls, release the trigger, remove the battery, and clear the obstruction only after the cutting system has stopped completely.

Match the tool to property size

For a small yard with routine grass maintenance, weight, storage, and simple edging may matter most. The compact 20V model is designed around those priorities, while the BLACK+DECKER 20V option offers a conventional trim-and-edge setup with adjustable handling.

For a medium property, two batteries or a larger battery platform can reduce interruptions. The WORX model is attractive when Power Share compatibility and wheel-assisted edging are useful. The BLACK+DECKER 40V model adds a power-versus-runtime dial and a charge indicator for users who want more control over consumption.

For irregular areas with tall weeds or small brush, the 4-in-1 13-inch model offers the most attachment flexibility. Its extra capability should not be confused with permission to cut every type of vegetation; work within the product instructions and use appropriate protective equipment.

Use sensible safety practices

Wear eye protection, sturdy closed-toe footwear, long pants, and hearing protection when appropriate. Keep bystanders and pets away from the cutting area, particularly when working near stones, fencing, or hard surfaces. Inspect the lawn first and remove objects that could be thrown by the line or blade.

Use the guard supplied with the trimmer, maintain a firm grip, and keep both hands positioned as instructed. Do not operate in wet conditions unless the manufacturer specifically permits it. Remove the battery before changing line, installing blades, cleaning the head, folding the shaft, or transporting the tool.

Best Cordless Grass String Trimmer FAQ

What is the best cordless grass string trimmer for most homeowners?

The 13″ Electric Weed Wacker is the strongest overall choice in this group because it combines a 13-inch cutting width, two 21V 6.0Ah batteries, a brushless motor, and four functions. It is especially appealing when trimming, edging, brush cutting, and small-shrub work may all be needed.

Which cordless trimmer is best for simple edging?

The WORX 20V 12″ 2-in-1 Cordless String Trimmer is a strong edging choice because it includes rubberized support wheels, a 90-degree tilting head, and an adjustable spacer guard. Those features can help guide the tool and protect nearby landscape elements.

Are two batteries better than one for a cordless string trimmer?

Two batteries can reduce interruptions, particularly for larger yards. However, total capacity matters more than battery count alone. Two 2.0Ah batteries may provide less working capacity than two 6.0Ah batteries, and actual runtime changes with vegetation density, line engagement, and power settings.

Can these cordless trimmers cut thick weeds?

They can handle ordinary weeds and grass, but capability varies. The 13″ Electric Weed Wacker is the only listed model with metal and saw blade options for tougher cutting tasks. The compact 20V trimmer is specifically positioned for basic maintenance and advises against excessively thick or dense material.

What should I do if an automatic trimmer spool stops feeding line?

Release the trigger, remove the battery, and inspect the spool for tangles, debris, incorrect winding, or damage. Confirm that the replacement spool and line match the manufacturer’s requirements. Never pull at a jammed head while the battery remains installed.

Is a 12-inch or 13-inch cutting width better?

A 13-inch swath can cover open edges more quickly, while a 12-inch swath may offer slightly easier control around plants, narrow borders, and crowded spaces. The better size depends on whether speed or precision is more important for your yard.

Final Verdict

The 13″ Electric Weed Wacker is the leading all-around choice for buyers who want maximum versatility, larger included battery capacity, and multiple cutting options. The WORX 20V 12″ 2-in-1 Cordless String Trimmer is the better focused alternative for convenient trim-and-edge work, especially within the WORX Power Share ecosystem. Choose among the remaining models by prioritizing battery compatibility, storage, runtime, and the type of vegetation you maintain most often.