5 Best 20 Volt String Trimmer Picks for Cordless Yard Care

Are you looking for the best 20 volt string trimmer for trimming grass, cleaning fence lines, and edging around sidewalks without dealing with gasoline or an extension cord? A good 20V cordless string trimmer should be light enough for regular lawn maintenance while still providing adequate cutting width, line control, battery runtime, and power for common weeds.

My first choice is the WORX WG163 GT 3.0 20V PowerShare 12-Inch String Trimmer & Edger. It currently has by far the strongest Amazon buyer history of these picks at roughly 28,000 reviews, while offering a 12-inch cutting swath, Command Feed line control, two batteries, an edging wheel, and a lightweight design.

The BLACK+DECKER LSTE525 20V MAX 12-Inch String Trimmer/Edger is another excellent homeowner option, especially if you want easy edging and a simple line-feed system. Its Amazon listing has approximately 14,000+ reviews, and BLACK+DECKER includes two 1.5Ah batteries with the common kit.

For thicker grass and buyers who already own professional-style cordless tools, the DEWALT DCST922P1 20V MAX 14-Inch Brushless Folding String Trimmer is the stronger performance-oriented choice. Its brushless motor, 14-inch cutting swath, 0.080-inch line, variable-speed trigger, 5.0Ah battery, and folding shaft make it better suited to more demanding trimming.

Best 20 Volt String Trimmer Picks

How I Ranked These 20V String Trimmers

Amazon review history received extra weight in this ranking.

Based on current Amazon-derived marketplace data, the approximate review order is:Review counts change continuously and can vary slightly when Amazon combines or separates product variations.

I also compared cutting swath, trimmer line diameter, battery capacity, motor type, line-feed mechanism, weight, edging capability, shaft adjustability, speed control, battery ecosystem, and suitability for grass and weeds.

Another important point: products labeled 20V MAX normally operate at approximately 18 volts nominally. The 20V figure describes maximum initial battery voltage rather than loaded operating voltage. BLACK+DECKER, DEWALT, and CRAFTSMAN all explicitly explain this in their specifications.

Best 20 Volt String Trimmer Picks for Cordless Yard Care

1. WORX WG163 GT 3.0 20V PowerShare 12-Inch String Trimmer & Edger– Best Overall

The WORX WG163 GT 3.0 earns first place because it combines enormous Amazon buyer history with the features most homeowners actually need from a lightweight battery weed eater.

Current Amazon-market tracking lists approximately 28,000 reviews and places it among the top-selling cordless string trimmers.

WORX gives you a 12-inch cutting diameter, 0.065-inch trimmer line, 7,600 RPM no-load speed, two 20V PowerShare batteries in the common kit, and a machine weight of only about 5.3 pounds.

Command Feed Gives You Control

One of its best features is Command Feed.

Instead of repeatedly bumping the trimmer head against the ground, you press a button when you need additional line.

This gives the operator more control than a conventional bump-feed head and can be easier for homeowners unfamiliar with gas-style string trimmers.

Excellent Trimmer-to-Edger Conversion

The head rotates to turn the tool into a wheeled lawn edger.

Support wheels help guide the cutting head along sidewalks, driveways, and garden borders, producing a more consistent edge than trying to manually hold the trimmer sideways.

For suburban lawn maintenance, this 2-in-1 design can eliminate the need to buy a separate light-duty edger.

Lightweight and Adjustable

At around 5.3 pounds, the WG163 is one of the easiest trimmers here to carry.

The telescoping shaft, adjustable auxiliary handle, 90-degree pivoting head, and plant-protection spacer make it particularly useful around shrubs, flower beds, slopes, and landscaping.

This matters because string trimming often involves more awkward movements than mowing.

You may need to reach under bushes, work around fences, trim beside raised beds, and rotate the machine for edging.

Lower weight reduces fatigue during all of those tasks.

PowerShare Battery Ecosystem

The WORX PowerShare platform is another advantage.

WORX uses its 20V packs individually in 20V products and combines compatible batteries in higher-voltage tools. This lets the same battery family support numerous lawn, garden, and power tools.

That increases long-term value if you plan to add a blower, hedge trimmer, drill, or other compatible equipment.

Where It Falls Short

The WG163 is fundamentally a lightweight homeowner trimmer.

Its 0.065-inch single line is appropriate for lawn grass and normal weeds but is not what I would choose for repeatedly clearing thick, woody, neglected vegetation.

The 12-inch cutting width is also narrower than DEWALT’s 14-inch swath.

If raw cutting performance is your priority, the DEWALT below is stronger.

Who Should Buy It?

Choose the WORX WG163 if you want a lightweight cordless weed eater for small or medium residential yards, especially if edging convenience and easy handling matter more than maximum power.

Its combination of huge buyer history, low weight, two-battery kit, and versatile adjustment makes it the safest overall choice.

2. BLACK+DECKER LSTE525 20V MAX 12-Inch String Trimmer/Edger- Best for Small Yards

The BLACK+DECKER LSTE525 is another highly established 20V string trimmer, with current Amazon data showing roughly 14,184 reviews.

It uses a 12-inch cutting swath, EASYFEED line advancement, two-speed control, PowerDrive transmission, and a rotating design that converts the trimmer into a wheeled edger.

The common LSTE525 kit includes two 20V MAX 1.5Ah lithium-ion batteries and a charger.

EASYFEED Is Convenient

The EASYFEED system advances cutting line at the push of a button.

That means no bumping the spool against the ground.

For users moving from a basic corded trimmer or using a string trimmer for the first time, this can make operation more intuitive.

Two-Speed Control

BLACK+DECKER gives you two operating speeds.

Use the lower setting when trimming normal grass and trying to preserve battery capacity.

Switch to the higher power setting when encountering heavier vegetation.

This is useful because cordless trimmer runtime depends heavily on motor load.

Running at maximum output when trimming thin lawn grass wastes energy.

PowerDrive Transmission

The LSTE525 uses BLACK+DECKER’s PowerDrive transmission, designed to increase torque at the cutting string.

It does not transform the trimmer into a professional brush cutter, but it gives a lightweight 20V platform enough capability for typical fence lines, grass around trees, and moderate weeds.

Adjustable for Different Users

An adjustable shaft and handle help accommodate different heights and working positions.

The wheeled edging configuration is especially useful around concrete sidewalks and driveways.

Instead of trying to visually maintain a straight line while holding the trimmer head sideways, the wheel supports the tool and helps guide the cut.

Battery Capacity Is the Main Limitation

Two batteries are included, which sounds generous, but each is only 1.5Ah.

For a small yard, that can be perfectly adequate.

For a large property with extensive trimming, larger-capacity batteries or another trimmer may be more practical.

Who Should Buy It?

The LSTE525 is best for small suburban lawns, townhomes, fenced backyards, sidewalks, driveway edging, and routine grass trimming.

Its enormous review history and straightforward controls make it particularly appealing to casual homeowners.

3. DEWALT DCST922P1 20V MAX 14-Inch Brushless Folding String Trimmer- Best Heavy-Duty

The DEWALT DCST922P1 is the strongest performance-oriented trimmer in this group.

Amazon-derived review data shows approximately 4,221 reviews at around 4.4 stars, giving it a substantial ownership history despite having fewer ratings than WORX or BLACK+DECKER.

DEWALT equips it with a brushless motor, 14-inch cutting swath, 0.080-inch line, variable-speed trigger, Hi/Lo speed selector, QuickLoad spool, folding shaft, and 5.0Ah 20V MAX battery.

14-Inch Cutting Swath

A 14-inch cutting path is significantly more productive than the 10- to 12-inch heads found on many homeowner 20V trimmers.

Each sweep cuts more vegetation.

That matters around long fence lines, drainage areas, sheds, and larger landscaped properties.

Brushless Motor

The brushless motor is another major advantage.

Brushless motors eliminate carbon brushes and generally provide better efficiency and power management than traditional brushed designs.

On a battery-powered trimmer, better efficiency can translate into useful performance without unnecessarily wasting battery energy.

0.080-Inch Line Handles More

The DEWALT uses 0.080-inch trimmer line, compared with 0.065-inch line on several lighter models in this guide.

Thicker line usually withstands tougher vegetation and contact with hard surfaces better.

It still is not brush-cutter line, but it is a meaningful step up for homeowners dealing with heavier grass and weeds.

Variable Speed and Hi/Lo Control

DEWALT combines a variable-speed trigger with a Hi/Lo range switch.

That gives you finer control over the balance between runtime and cutting power.

Use lower output near delicate landscaping or on light grass.

Increase output when the trimmer enters denser vegetation.

Folding Shaft Saves Space

The shaft folds at a hinge, reducing its overall length by about 40% when folded according to DEWALT.

This makes a surprisingly large difference if you store outdoor equipment on garage shelves or need to transport the trimmer in a vehicle.

5.0Ah Battery Adds Useful Capacity

The included 5.0Ah battery has considerably more capacity than the small batteries packaged with many light-duty 20V models.

Actual runtime still depends on vegetation density, speed setting, line length, battery condition, and technique.

But the larger pack makes the DEWALT much better suited to sustained trimming.

Who Should Buy It?

Choose the DCST922P1 if you want the most powerful and work-oriented 20V string trimmer in this comparison.

It is particularly attractive for homeowners already invested in DEWALT 20V MAX batteries.

4. CRAFTSMAN CMCST900D1 V20 13-Inch String Trimmer/Edger– Best Value Kit

The CRAFTSMAN CMCST900D1 sits nicely between the ultra-light homeowner trimmers and the heavier DEWALT.

Current Amazon-market data shows roughly 2,385 reviews with a 4.4-star rating.

CRAFTSMAN gives it a 13-inch cutting swath, automatic line advancement, two speed settings, telescoping shaft, trimmer-to-edger conversion, 0.065-inch line, and a V20 2.0Ah battery.

13 Inches Is a Good Compromise

A 13-inch head covers more ground than the common 12-inch homeowner trimmers without becoming as bulky as larger professional units.

That makes it useful for small-to-medium lawns.

You get reasonable productivity around long borders but retain good maneuverability around flower beds and trees.

Automatic Line Feed

CRAFTSMAN uses automatic line advancement, meaning you do not need to bump the head on the ground.

Some users prefer push-button systems because they provide direct control over when line advances, but automatic feed can make routine trimming nearly hands-off.

Two Speed Settings

Like BLACK+DECKER, CRAFTSMAN offers two speeds.

This lets you select more runtime or more cutting performance.

For normal lawn grass, running in the lower setting can extend the useful time you get from the included 2.0Ah pack.

Converts to an Edger

The trimmer rotates for lawn edging, making it suitable for sidewalks, driveways, curbs, and landscaping borders.

An adjustable telescoping pole also makes the working height easier to tailor to the operator.

V20 Battery Platform

The battery works within the broader CRAFTSMAN V20 system, including compatible outdoor equipment and power tools.

This makes the kit substantially more attractive if you already own CRAFTSMAN cordless tools.

Who Should Buy It?

Choose the CMCST900D1 if you want a balanced 20V trimmer/edger kit with a 13-inch swath and prefer CRAFTSMAN’s battery ecosystem.

It works best for normal residential lawn maintenance rather than clearing heavy brush.

5. Litheli 20V 12-Inch Cordless String Trimmer/Edger- Best Lightweight Budget Pick

The Litheli 20V 12-inch cordless string trimmer is the budget-focused option in this comparison.

Amazon-derived listing data shows approximately 863 reviews, a 12-inch cutting width, 2.0Ah battery, 6,550 RPM speed, and a very low tool weight of around 4.5 pounds.

That makes it particularly appealing to homeowners who find larger trimmers tiring.

Extremely Lightweight

At roughly 4.5 pounds, this is one of the easiest machines here to maneuver.

Low weight matters when you’re trimming around many obstacles because you are constantly lifting, rotating, and repositioning the cutting head.

It can also be helpful for smaller users or anyone who simply dislikes carrying heavy yard equipment.

12-Inch Cutting Width

A 12-inch cutting swath is appropriate for small residential properties.

It is wide enough for normal fence lines and landscaping without making the tool difficult to control in tight areas.

Trimmer and Wheeled Edger

The tool converts between trimming and edging modes.

Its adjustable head can also help when working along slopes or beneath landscaping.

The lightweight format makes these adjustments easier to take advantage of because you are not fighting a heavy motor assembly.

Auto Line Feed

An automatic line-feed system advances 0.065-inch cutting line, reducing the need for conventional bump feeding.

Again, this makes it best suited to ordinary lawn grass rather than woody growth.

Battery Platform Is Less Established

The biggest reason Litheli ranks fifth is not weight or cutting capability.

It is ecosystem depth and ownership history.

WORX, BLACK+DECKER, DEWALT, and CRAFTSMAN have larger established battery-tool ecosystems and significantly greater Amazon review counts for the specific trimmers selected.

Litheli can still represent good value when priced aggressively, but I would first consider how easy replacement batteries and spools will be to obtain over the years you expect to own the trimmer.

Who Should Buy It?

Choose Litheli if you have a small lawn and want a very lightweight, inexpensive cordless trimmer for grass, borders, and occasional edging.

Best 20 Volt String Trimmer Comparison

Product	Approx. Amazon Reviews	Cutting Swath	Line	Battery	Motor/Control	Best For
WORX WG163	~28K	12 in.	0.065 in.	20V, 2 batteries	7,600 RPM	Best overall
BLACK+DECKER LSTE525	~14.2K	12 in.	0.065 in. class	2 × 1.5Ah	2 speeds	Small yards
DEWALT DCST922P1	~4.2K	14 in.	0.080 in.	5.0Ah	Brushless, variable speed	Heavy trimming
CRAFTSMAN CMCST900D1	~2.4K	13 in.	0.065 in.	2.0Ah	2 speeds	Best value
Litheli 20V	~860	12 in.	0.065 in.	2.0Ah	Auto feed	Lightweight use

Is a 20 Volt String Trimmer Powerful Enough?

Yes, a 20V string trimmer is powerful enough for most routine residential trimming.

The key phrase is routine maintenance.

A 20V cordless weed eater is excellent for grass around trees, fence lines, sidewalks, flower beds, driveway edges, raised beds, and common lawn weeds.

It becomes less appropriate when you regularly deal with:

Dense brush, woody stalks, abandoned lots, very thick field grass, or large properties requiring prolonged operation.

In those conditions, a 40V, 56V, 60V, or professional gas trimmer may make more sense.

20V vs. 40V String Trimmer

The most noticeable difference is generally not voltage itself but the overall tool class.

20V Advantages

A 20V weed eater tends to be:

Lighter

Less expensive

Easier to maneuver

Easier to store

Well suited to smaller yards

Compatible with common power-tool batteries

40V Advantages

A 40V-class trimmer often provides:

Higher sustained power

Larger cutting swath

Thicker trimmer line

Longer runtime with large batteries

Better performance in dense weeds

The tradeoff is additional weight and cost.

If your lawn is only a quarter acre and you trim after every mowing, a good 20V machine can be the more comfortable choice.

20V MAX vs. True 20V: What Does It Mean?

You will see 20V MAX printed prominently on several tools.

This does not mean those batteries continuously operate at 20 volts.

BLACK+DECKER states that maximum initial battery voltage is 20V while nominal voltage is 18V. DEWALT and CRAFTSMAN use similar labeling.

This is normal battery marketing.

Do not reject one tool because another company labels a similar battery as 18V.

Instead compare the complete system:

Motor efficiency, battery watt-hours, cutting swath, line diameter, speed, runtime, and tool weight.

What Cutting Swath Is Best?

For a typical homeowner, 12 to 14 inches works well.

12-Inch Trimmer

Best for:

Small yards

Tight landscaping

Light weight

Precision trimming

WORX, BLACK+DECKER, and Litheli all fall into this category.

13-Inch Trimmer

CRAFTSMAN’s 13-inch swath gives you slightly more productivity while remaining compact.

14-Inch Trimmer

DEWALT’s 14-inch head clears the largest area per pass among these five.

It makes more sense if you have longer fence lines or heavier vegetation.

0.065 vs. 0.080 Trimmer Line

Line diameter affects durability and cutting capability.

A 0.065-inch line is common on lightweight homeowner trimmers.

It works well for normal grass, lawn edges, and light weeds.

A 0.080-inch line is stronger and better suited to thicker vegetation.

DEWALT’s use of 0.080-inch line is one reason it is my heavy-duty recommendation.

Thicker is not always better, however.

Use only line sizes approved by the manufacturer.

Oversized line can increase motor load and interfere with proper spool operation.

Automatic Feed vs. Push-Button Feed

There are three common ways to advance string.

Automatic Feed

The trimmer automatically releases more line as needed.

This is convenient but gives the operator less direct control.

Push-Button Feed

WORX Command Feed and BLACK+DECKER EASYFEED let you intentionally advance line with a button.

This is one of my preferred systems for casual homeowners.

Bump Feed

Traditional trimmers often require tapping the cutting head against the ground while it is spinning.

Experienced users usually find bump feed simple, but new users sometimes struggle with it.

For light-duty homeowner use, push-button feed is extremely convenient.

Brushless vs. Brushed String Trimmer

A brushless motor offers real benefits.

It eliminates carbon brushes and can improve efficiency, motor life, and power management.

The DEWALT DCST922P1 uses a brushless motor.

However, that does not mean every brushed trimmer is bad.

A basic brushed motor can be perfectly adequate when your trimming sessions last 10 or 15 minutes.

The enormous ownership histories of the WORX and BLACK+DECKER products show that many homeowners value low weight and simplicity more than premium motor architecture.

How Much Battery Capacity Do You Need?

Battery capacity is typically measured in amp-hours (Ah).

A larger Ah rating generally stores more energy when comparing batteries at the same voltage.

For example, DEWALT’s 5.0Ah battery provides much more capacity than a 1.5Ah pack from the same voltage class.

But runtime still depends on:

Vegetation density

Motor efficiency

Cutting speed

Line length

Battery age

Ambient temperature

Operator technique

Do not assume that doubling Ah always doubles real trimming time under different workloads.

Should You Buy a String Trimmer With Two Batteries?

Two batteries can be very useful.

The WORX kit includes two PowerShare packs, while the BLACK+DECKER LSTE525 commonly includes two batteries as well.

This lets you continue working when the first battery is depleted.

It can also be valuable when the same batteries operate other yard tools.

However, battery size matters.

Two small 1.5Ah batteries do not necessarily provide more stored energy than one premium 5.0Ah pack.

Can a 20V Trimmer Cut Thick Weeds?

Yes, within reason.

For heavier growth, I prefer the DEWALT because of its 14-inch swath, brushless motor, variable-speed control, and 0.080-inch line.

For standard grass and light weeds, any of the five products can be appropriate.

When vegetation becomes thick, use slower sweeping motions.

Do not force the entire cutting head into dense growth at once.

Let the outer tip of the string do the cutting.

Can You Use a String Trimmer as an Edger?

Several 20V trimmers are specifically designed as 2-in-1 trimmer/edger tools.

WORX uses support wheels for edging.

BLACK+DECKER converts to a wheeled edger.

CRAFTSMAN also rotates for edging.

These designs are useful for maintaining crisp borders along:

Sidewalks, driveways, curbs, patios, and flower beds.

A dedicated blade edger will usually produce a deeper, more defined trench, but a convertible string trimmer is enough for many homeowners.

Straight Shaft vs. Adjustable Shaft

Long professional trimmers typically use a fixed straight shaft for reach and durability.

Light-duty 20V machines frequently use adjustable or telescoping shafts.

For residential use, adjustability has several advantages.

You can set the tool to your height.

You can shorten it for storage.

Some designs also rotate or pivot for edging.

If several people in a household share the trimmer, a telescoping shaft can be particularly convenient.

Battery Ecosystem Matters

Do not evaluate the trimmer in isolation.

A replacement lithium-ion battery can represent a meaningful portion of the purchase price.

If you already own:

DEWALT 20V MAX

CRAFTSMAN V20

BLACK+DECKER 20V MAX

or WORX PowerShare

tools, staying with your existing platform can make economic sense.

You may already own several batteries and chargers.

In that case, buying a bare-tool string trimmer may be cheaper than purchasing an entirely new cordless ecosystem.

How to Get Better String Trimmer Runtime

Keep the string at the manufacturer’s intended length.

Excessively long line increases drag.

Use lower speed when cutting thin grass.

Do not repeatedly run the motor at full power when it is unnecessary.

Keep the cutting head free from grass wrapped around the shaft.

Use a sharp, correctly sized trimmer line.

And store lithium-ion batteries according to manufacturer temperature recommendations.

How to Trim Grass Correctly

Hold the head level when trimming open grass.

Avoid scalping the lawn by angling the string too aggressively downward.

Work gradually around tree trunks.

Repeated direct contact from trimmer line can damage tree bark.

Use plant guards when available.

Near fences and walls, allow only the outer tip of the string to contact vegetation.

Constantly slamming the full line into concrete or metal dramatically increases line consumption.

Frequently Asked Questions

What is the best 20 volt string trimmer?

The WORX WG163 GT 3.0 is the best overall 20V string trimmer for most homeowners.

It combines a lightweight 12-inch cutting platform, Command Feed, wheeled edging, two batteries, extensive adjustment, and approximately 28,000 Amazon reviews.

Which 20V string trimmer has the most Amazon reviews?

The WORX WG163 has the largest Amazon review history among these five picks.

Current marketplace tracking shows approximately 28,000 reviews, substantially ahead of BLACK+DECKER’s roughly 14,000.

Is a 20V weed eater good enough for a small yard?

Yes, a 20V cordless weed eater is ideal for many small yards.

It provides enough power for ordinary lawn grass and weeds while remaining lighter than many higher-voltage models.

Is DEWALT 20V string trimmer powerful?

Yes, the DCST922P1 is the strongest performance-oriented model in this comparison.

It combines a brushless motor, 14-inch cutting swath, variable-speed control, 0.080-inch line, and 5.0Ah battery.

Is WORX or BLACK+DECKER better?

WORX is my overall choice, while BLACK+DECKER is excellent for straightforward small-yard trimming.

WORX has the larger current review history and a highly adjustable design, while BLACK+DECKER provides EASYFEED, two speeds, and two included batteries.

How long does a 20V string trimmer battery last?

Runtime varies widely with battery Ah, grass density, speed, line size, and motor efficiency.

Light trimming may run much longer than cutting dense weeds continuously at maximum speed.

Is 20V the same as 18V?

In many cordless systems, 20V MAX batteries are approximately 18V nominal.

The 20V figure represents maximum initial voltage measured without workload.

Is a brushless string trimmer better?

Brushless motors generally offer better efficiency and fewer wear components.

They are particularly worthwhile when trimming heavier vegetation or using the tool frequently.

What line size should I use in a 20V string trimmer?

Use the line diameter specified by the manufacturer.

Several light-duty models here use 0.065-inch line, while DEWALT uses heavier 0.080-inch line.

Is a 12-inch string trimmer big enough?

Yes, 12 inches is a practical cutting width for small residential yards.

A 13- or 14-inch trimmer becomes more efficient when you have more fence line or a larger property.

Can a 20V trimmer edge sidewalks?

Yes, several models here convert directly into lawn edgers.

WORX, BLACK+DECKER, CRAFTSMAN, and Litheli all provide edging-oriented configurations.

Which 20V trimmer is best for thick weeds?

The DEWALT DCST922P1 is my first choice for thicker vegetation.

Its wider swath, brushless motor, 0.080-inch line, and larger included battery give it more capability than lightweight homeowner models.

Final Verdict

The WORX WG163 GT 3.0 is my overall winner for the best 20 volt string trimmer. Its combination of approximately 28,000 Amazon reviews, lightweight construction, 12-inch cutting width, Command Feed line control, adjustable shaft, pivoting head, wheeled edging, and two included batteries makes it exceptionally well suited to everyday residential lawn care.

The BLACK+DECKER LSTE525 is my favorite small-yard alternative. Its EASYFEED system, two-speed control, wheeled edger conversion, and two-battery kit give homeowners an easy-to-use package backed by roughly 14,000 Amazon reviews.

If cutting performance matters more than minimum weight, choose the DEWALT DCST922P1. Its brushless motor, 14-inch swath, 0.080-inch line, 5.0Ah battery, variable speed, and folding shaft put it much closer to a work-oriented trimmer.

The CRAFTSMAN CMCST900D1 provides a useful middle ground with a 13-inch swath and established V20 battery platform, while the Litheli 20V 12-inch trimmer makes sense for buyers who mainly want an inexpensive, lightweight machine for a small property.

For most homeowners, the best choice is not automatically the trimmer with the highest voltage or widest cutting head. Match battery capacity, cutting swath, trimmer line diameter, tool weight, edging capability, and battery ecosystem to the size and condition of your yard.