You want a cordless string trimmer that chews through your grass without chewing through your wallet. You need battery life long enough to finish the whole yard, a motor that does not stall on thick patches, and a design that does not leave your arms sore the next day.
I’m Mohammad Maruf — the co-founder and writer behind WellFizz. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
From a small city lawn to a quarter-acre suburban lot, these seven models are the best cordless string trimmers under $100 that actually deliver reliable, cord-free trimming. best cordless string trimmer under $100
How To Choose The Best Cordless String Trimmer Under $100
A trimmer under $100 all comes down to a few specs that decide if you love using it or get annoyed after one battery dies. Here is what to check.
Battery Capacity (Ah) and Number of Batteries
Battery amp-hours (Ah) tell you how long the trimmer can run — more amp-hours mean more runtime per charge. Think of it as the fuel tank: a 4.0 Ah battery holds double the energy of a 2.0 Ah one. Many trimmers in this price range include two batteries so you swap and keep cutting while the first one charges. That combo, plus amp-hours, matters way more than voltage (20V is standard here).
Cutting Width and Motor Speed (RPM)
Cutting width is the swath of grass cleared in one pass, measured in inches. A 12-inch width handles most yards efficiently; a 13-inch option covers more ground faster. Motor speed (RPM, or revolutions per minute) decides how easily the line slices through thick weeds. High RPM — 9,500 or more — cuts through overgrown grass fast, but it also drains the battery sooner. That is the catch.
Line Feed System: Automatic vs. Bump vs. Manual
An automatic feed (auto-feed) system is most convenient: it releases more string whenever you start the motor. Bump feed means you tap the head on the ground to advance the line. Manual feed requires you to stop and pull the line out by hand. Under $100, auto-feed is common and saves time, but some models can over-feed and waste string. Bump feed gives you more control but needs a bit more effort while you work.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| ALSO GO 21V Weed Wacker | Mid-Range | Big yards, long runtime | 2×4.0Ah batteries, 9500 RPM | Amazon |
| JAGROM 12″ Trimmer | Mid-Range | Small/medium yards, value | 2×2.0Ah batteries, 9500 RPM | Amazon |
| MZK 20V 12″ Trimmer | Mid-Range | Year-round use, extra spools | 2×4.0Ah batteries, 8000 RPM | Amazon |
| BLACK+DECKER LST300 | Mid-Range | Trusted brand, simple operation | 1×2.0Ah battery, 6200 RPM | Amazon |
| VARSK 12″ Weed Wacker | Premium | Balanced feel, many extras | 2×2.0Ah batteries, 7.7 lbs | Amazon |
| WeGofly 13″ 4-in-1 | Premium | Heavy duty, longest battery | 2×6.0Ah batteries, 15000 RPM | Amazon |
| WORX WG163 | Premium | Brand ecosystem, light weight | 2×20V batteries, 5.5 lbs | Amazon |
In‑Depth Reviews
1. ALSO GO 21V Weed Wacker
The ALSO GO takes the top spot because it gives you the best blend of runtime and power under $100. It ships with two high-capacity, 4.0Ah batteries — buyers report that a single 4.0Ah pack does “an entire front yard of long grass.” The 9500 RPM motor (revolutions per minute, the head-spin speed) chews through thick growth without stalling. This trimmer suits anyone with a medium to large yard who wants to finish mowing on one set of batteries rather than waiting for a recharge.
At 5.95 lbs, it is lighter than the MZK 20V (which weighs 6.3 lbs), so you feel the difference when carrying it around flower beds and fence lines. The automatic line feed pushes out more string (the cutting filament) whenever the motor starts, so you never stop to tap the head on the ground. Reviewers consistently praise the fast charger and the 60–80 minute total runtime from the two batteries together.
The honest trade-off: you must hold a side button along with the trigger — there is no lock-on feature to keep it running. Some left-handed users found that awkward since the button favors right-hand grip. Still, two 4.0Ah batteries and a 9500 RPM motor at this price make the ALSO GO the most capable all-rounder here.
Why it’s great
- Two 4.0Ah batteries provide exceptional runtime
- 9500 RPM motor cuts through thick grass easily
- Lightweight at 5.95 lbs, easy to maneuver
Good to know
- Side button must be held with trigger, no lock-on feature
- Left-handed users may find button placement awkward
2. JAGROM 12″ Cordless String Trimmer
The JAGROM matches the ALSO GO on motor speed at 9500 RPM, but it uses two smaller 2.0Ah batteries instead of 4.0Ah packs — that is a 2.0x capacity gap, so about half the runtime per battery. That makes more sense for smaller yards where 30–40 minutes per battery finishes the job. If your lawn is under a quarter acre and you want to save money without losing motor power, this is the smarter pick over the ALSO GO.
Reviewers consistently call it lightweight and easy to handle. One buyer reports the two batteries give roughly 60 minutes combined and notes letting the battery cool before plugging it in to charge. The 2-in-1 design flips from trimmer to edger (edge-cutter) by twisting the head, and the shaft folds 180 degrees for compact storage in a shed or garage.
Choose this over the top pick if you have a small to medium lawn, value a lower upfront cost, like the foldable storage, and do not need the extended runtime of the larger 4.0Ah batteries.
Where it shines
- Powerful 9500 RPM motor at a budget-friendly price
- 180° foldable shaft for easy storage
- 2-in-1 trimmer and edger with twist-head conversion
Worth noting
- 2.0Ah batteries provide less runtime than larger packs
- Battery should cool before placing on the charger
3. MZK 20V 12″ Cordless String Trimmer
If you hate stopping mid-job to add new trimming line — or want to avoid buying replacement spools for a year — the MZK is your trimmer. It includes one pre-loaded spool plus four additional replacement spools (eight spools total), which owners mention last a whole season of regular trimming. The two included 4.0Ah batteries match the ALSO GO on capacity, so you get the same long runtime between charges.
The MZK’s 8000 RPM motor is 19% slower than the JAGROM’s 9500 RPM motor, so it cuts thick weeds a little less aggressively. Even so, customers note that “the battery charges in 2 hours, lasts long,” and they say it handles tall weeds and thick grass without bogging down. The automatic line feed works reliably, and the adjustable ergonomic handle reduces fatigue during longer sessions.
The standout spec here is the eight included spools — by far the most generous supply in this lineup.
What stands out
- Comes with 8 total replacement spools for long-term use
- Two 4.0Ah batteries provide extended runtime
- Adjustable ergonomic handle reduces fatigue
The trade-offs
- 8000 RPM motor is slower than some competitors
- Weighs 6.3 lbs, slightly heavier than top pick
4. BLACK+DECKER 20V MAX LST300
The single number that matters most in this category is cutting speed, and the BLACK+DECKER 20V MAX LST300 delivers a lower speed than most competitors. That lower speed means it struggles more on thick or overgrown weeds. Buyers confirm this, noting it is “less powerful and slower than older model.” It fits best for light, routine trimming on a well-maintained lawn where the grass is already short.
What you trade for the lower power is the trusted BLACK+DECKER name and a reliable automatic feed spool (AFS) system that never needs a bump tap. This trimmer comes with just one 2.0Ah battery, while most competitors give you two — so you get about 15 minutes of runtime per charge. Reviewers point out the battery takes “several hours to charge.” That is a real limit if your yard is bigger than tiny.
At 5.7 lbs, it is lightweight and comfortable, and the battery works with other BLACK+DECKER 20V tools if you already own them. For buyers seeking a familiar brand and basic trimming on a small lawn, this is a modest price-to-value read.
The upsides
- Trusted BLACK+DECKER brand with compatible battery ecosystem
- Lightweight at 5.7 lbs for easy handling
- Automatic feed spool (AFS) requires no bumping
Keep in mind
- 6200 RPM motor lags behind competitors
- Only one 2.0Ah battery, about 15 minutes of runtime
- Long charge time of several hours
5. VARSK 12 Inch 20V Cordless Weed Wacker
What you actually get at this lower price is a well-balanced tool that reviewers call “easy to assemble, lightweight, well-balanced,” plus a generous bundle with six replacement spools, one charger, and two 2.0Ah batteries — the same smaller capacity found on the budget JAGROM, even though the VARSK costs more than the ALSO GO and MZK.
At 7.7 lbs, it is the heaviest trimmer here — 1.75 lbs more than the ALSO GO — so it feels more solid in hand but can tire you on longer jobs. Shoppers say the automatic line feed runs smoothly and the 2-in-1 trimmer/edger switch works fine. One reviewer says it easily handles their front and back yard on a single battery pair; another notes it needs two passes for tall grass near raised beds.
The price-to-performance read: you get a well-made tool with lots of extras, but the battery capacity does not measure up to top picks at the same or lower cost. This is the exact budget buyer it is perfect for: someone who values six spare spools and responsive customer support more than raw battery runtime.
Why we’d pick it
- Comes with six replacement spools and two batteries
- Well-balanced design praised for comfortable handling
- Smooth automatic line feed system
A few caveats
- Heavier than most at 7.7 lbs
- 2.0Ah batteries offer less runtime than some competitors
6. WeGofly 13″ 4-in-1 Cordless String Trimmer
This trimmer is for the homeowner with serious brush — the kind where a standard trimmer bogs down and leaves half the weeds standing. The WeGofly packs a 15000 RPM brushless motor (58% faster than the ALSO GO’s 9500 RPM) and two oversized 6.0Ah batteries that buyers report last long enough to clear two acres of brush over two days. It also cuts a wider 13-inch swath, so you cover more ground per pass.
The 4-in-1 design includes attachments for trimming, edging, mini lawn mowing, and brush cutting, with steel gears that the manufacturer says prevent motor burnout. Reviewers praise the powerful, durable nylon line and say it outperforms previous models where the line broke too fast. The telescopic pole adjusts to different heights, and assembly needs no tools.
One real limit: a buyer found it “hard to push” when used like a wheeled mower and says it lacked power for bamboo stumps, needing frequent pauses to regain blade speed. For routine grass and weed trimming around the yard, though, the battery life and motor power here are unmatched in this price range.
Strong points
- Massive 6.0Ah batteries provide the longest runtime in the lineup
- 15000 RPM brushless motor with steel gears for tough brush
- 13-inch cutting width covers more ground per pass
Before you buy
- Some wheeled applications lack power for thick bamboo stumps
- Heavier build may feel bulky for small trimming tasks
7. WORX WG163 Cordless String Trimmer & Edger
The WORX WG163 sits at the lower end of the price range in this guide, offering strong value if you already own WORX tools — its two 20V batteries are interchangeable with the entire Power Share family, a perk no other pick here provides.
You get a 7600 RPM motor (20% slower than the top pick’s 9500 RPM), a 12-inch cutting width, and a push-button Command Feed spool system that advances line on demand. The trimmer includes rubberized support wheels for edging, a spacer guard to protect plants, and a head that tilts 90 degrees for sloped terrain. Buyers praise the “free spools for life” program — with a quick registration, WORX sends you free replacement spools indefinitely.
The one clear reason to choose this: compatibility. If you already own WORX tools and want a single battery platform, this is the obvious pick.
What we like
- Lightest trimmer at 5.5 lbs for effortless handling
- WORX Power Share batteries work with other WORX tools
- Free spools for life program saves money long-term
The downsides
- 7600 RPM motor is slower than top competitors
- Charger can be very tight, making battery removal difficult
- Bogs down in thick or overgrown vegetation
Understanding the Specs
Battery Amp-Hours (Ah)
Amp-hours tell you your battery’s energy capacity — think of it as the fuel tank size. A 4.0Ah battery runs roughly twice as long as a 2.0Ah battery before needing a recharge. More Ah means more trimming time, but it also adds weight to the tool. For a medium yard (under a quarter acre), two 2.0Ah batteries are usually enough. For larger yards, two 4.0Ah batteries let you finish in one session.
Motor Speed (RPM)
RPM stands for revolutions per minute — how fast the cutting head spins. Higher RPM (9,000–15,000) cuts through thick weeds and tall grass more easily, but it drains the battery faster. Lower RPM (6,000–8,000) works fine for light maintenance on a well-kept lawn and extends battery runtime. Match the RPM to your typical grass condition: go higher if your yard is often overgrown, lower if it stays tidy.
Cutting Width
This is the diameter of the area the trimmer clears in one pass, measured in inches. A 12-inch width is standard and works well for most yards. A 13-inch width covers slightly more ground per pass, which means fewer passes and a faster job. The downside is that a wider cutting head can be a bit heavier and harder to maneuver in tight spots between flower beds or fence posts.
Weight and Balance
Weight matters because you carry the tool across your whole yard, not just hold it for a few seconds. Trimmers in this range weigh between 5.5 and 7.7 lbs. A lighter tool (under 6 lbs) causes less arm fatigue during longer sessions, but a slightly heavier tool often feels more solid and may have a bigger battery. Look for an adjustable handle and good weight distribution — a well-balanced 7 lb trimmer can feel easier to use than a poorly balanced 5.5 lb one.
FAQ
How long does a cordless string trimmer battery usually last?
Is automatic line feed better than bump feed?
Can I use a cordless trimmer on thick weeds and brush?
How do I know if a 12-inch cutting width is enough for my yard?
What does 2-in-1 trimmer and edger mean?
Final Thoughts: The Verdict
Across the board, the best cordless string trimmer under $100 winner is the ALSO GO 21V Weed Wacker because it gives you two large 4.0Ah batteries, a fast 9500 RPM motor, and a light 5.95 lb frame — enough power and runtime for a medium to large yard without tiring you out. For the lowest price with the same motor speed, grab the JAGROM 12″ Trimmer. And for heavy brush or the longest battery life, the WeGofly 13″ 4-in-1 with its 15000 RPM motor and two 6.0Ah batteries is the one to pick.
Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.