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Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
A cordless string trimmer under $100 sounds like a compromise — but spend ten minutes reading owner experiences and a clear truth emerges: battery life is the only spec that separates a trusty tool from a frustrating one. Some models deliver a full hour of cutting on a pair of batteries; others conk out in fifteen minutes. This guide cuts through the marketing to show you exactly which trimmers actually finish the yard.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. 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.
Every trimmer here stays under a sensible budget, runs on rechargeable batteries, and has been vetted through real owner feedback so you know which cordless string trimmer under $100 will actually hold up after the first few charges.
Our Picks at a Glance
How To Choose The Best Cordless String Trimmer Under $100
Picking a budget-friendly battery trimmer depends on three decisions that most owners say matter far more than brand names: how long the batteries actually last, how easy the line feed is to live with, and whether the cutting width matches your yard size. Here is what to look for in plain terms.
Battery Runtime: The make-or-break spec
A trimmer with two batteries that each run 30 minutes will finish a typical suburban yard. A trimmer whose batteries deliver only 15 minutes apiece means you will be charging between sections — frustratingly. Look for total runtime of at least 60 minutes across both batteries if you have a medium lawn, or at least 30 minutes for a small yard.
Auto Feed vs Bump Feed vs Manual
An automatic line feed releases new string every time you start the motor — convenient but slightly wasteful. A bump-feed head lets you tap the trimmer on the ground to release line, which many owners prefer for control. A few budget trimmers use manual feed only, which is less common. The auto-feed systems on these picks are the most owner-friendly in this price range.
Cutting Width and Motor Speed
A wider cutting swath (12 to 13 inches) means fewer passes along your fence line or flower bed. Motor speed, measured in RPM (revolutions per minute), influences how cleanly the trimmer cuts through thick grass. Most cordless trimmers under $100 spin between 8,000 and 9,500 RPM — enough for everyday grass and light weeds, not heavy brush.
Quick Comparison
| Model | Best For | Total Runtime | Cutting Width | Motor Speed | Amazon |
|---|---|---|---|---|---|
| BeautFirst 12-Inch★ Best Overall | Best Overall | 60+ min (2x 5.0Ah) | 12 in | — | Amazon |
| LPSUK 13-InchPremium Pick | Premium Pick | 30 min (1x 4.0Ah) | 13 in | 8,000 RPM | Amazon |
| Boltarc 21VLongest Runtime | Longest Runtime | 120 min (2x 4.0Ah) | 10 in | 9,000 RPM | Amazon |
| ALSO GO 12-Inch | Best Value | — (2x 2.0Ah) | 12 in | 9,500 RPM | Amazon |
| OKIE HOME 12-Inch | Top Performer | 60–80 min (2x 2.0Ah) | 12 in | 9,000 RPM | Amazon |
| HEINPRO for DeWalt | Best Compatibility | Depends on battery | 12 in | — | Amazon |
| KOMASTY 20V | Compact Pick | 30 min (2x 2.0Ah) | 12 in | 9,500 RPM | Amazon |
| VIBOGEN 21V | Budget Champion | 30–40 min (2x 2.0Ah) | 12 in | 9,000 RPM | Amazon |
In‑Depth Reviews
1. BeautFirst 12-Inch Cordless Weed Eater
The battery champ that keeps cutting while others recharge.
This is the one that rewrites the rulebook for budget trimmers. Two 5.0Ah batteries deliver a combined runtime north of 60 minutes — a full hour of continuous trimming, which is the standout spec in this entire list. The 12-inch cutting width is standard, but the real story is the massive energy reserve: you finish the front yard, back yard, and edges without swapping batteries mid-task.
Owners rave about the lightweight feel and the adjustable head, which rotates 0° to 90° for edging along flower beds and fences. The auto-feed line is reliable — as one owner put it, the string is “durable (no breaks after 3 uses).” The three-in-one design (trimmer, edger, and a wheeled mowing mode) adds genuine versatility many competitors at this level lack. The color is a clean black-green, and the detachable pole stores easily in a small shed corner.
Compared to the VIBOGEN 21V below, this unit offers four times the runtime (60 minutes vs 15 minutes per battery), making it dramatically more useful for anyone with a medium-to-large lawn. The trade-off is a smaller cutting width than the LPSUK 13-Inch — 12 inches vs 13 inches — but that 8% gap is trivial next to the battery advantage.
What Owners Love
- Two large 5.0Ah batteries — outstanding runtime for the price
- Lightweight design reduces fatigue during longer sessions
- Adjustable head and handle for comfortable trimming at any angle
- Automatic line feed works cleanly with very few interruptions
A Fair Trade-Off
- 12-inch cutting width is typical; a 13-inch swath would be faster for larger lawns
- Some owners note that very thick patches require a slower pass
- Brand is relatively new, so long-term parts availability is unproven
The crowd favorite: If you want a trimmer that actually finishes the whole yard on one battery cycle, this is the safest bet under $100.
Think twice if: You need a larger 13-inch cutting swath or prefer a bump-feed head — this unit uses auto-feed only.
2. LPSUK 13-Inch Electric Weed Wacker
The widest cut in this price bracket — fewer passes, faster finish.
This trimmer is the only one in the lineup with a 13-inch cutting width, which means each sweep covers 8% more ground than a standard 12-inch model. Powered by an 8,000 RPM motor, it cuts cleanly through grass and light weeds without bogging down. The single 4.0Ah battery provides about 30 minutes of run time — enough for a small-to-medium yard in one charge.
What sets this apart is the three-in-one flexibility: trimmer, edger, and mini-mower mode with support wheels that help you roll a straight line along sidewalks. Owners consistently praise the easy assembly and the dual-line auto feed, which releases replacement line automatically. The telescopic shaft adjusts from 38 to 49 inches to suit different heights — a real back-saver. Weighing just 5.5 lbs, it is light enough for anyone to handle comfortably.
Compared to the BeautFirst above, the LPSUK trades some battery capacity (30 min vs 60+ min) for a wider cut and a slightly more refined dual-line system. The slower 8,000 RPM motor is adequate for grass but less aggressive on thick weeds than the 9,500 RPM units in this list.
Wider swath, shorter session: Perfect for anyone who prioritizes speed-per-pass over extended runtime. The adjustable shaft and support wheels make this the most comfortable trimmer for precision edging.
Reach for this if: You want fewer passes along your fence line and value a light, adjustable tool that stores small.
Look elsewhere if: Your lawn is larger than a quarter acre — the single battery may not finish the job on one charge.
3. Boltarc 21V Cordless Weed Wacker
Two hours of cutting power — the marathon runner of budget trimmers.
The headline spec here is a jaw-dropper for this price point: two 4.0Ah batteries that together deliver up to 120 minutes of runtime. That is twice the runtime of the second-best option on this list. A 500W motor spins the head at 9,000 RPM, providing enough torque to slice through thick grass and established weeds without slowing. The cutting width is a narrower 10 inches, which is the trade-off for that extraordinary battery endurance.
Owners describe it as lightweight and easy to manage, with a 90° rotating head that converts from trimming to edging in seconds. The auto-feed line system keeps the string at optimal length automatically. The package includes eight replacement spools, so you are set for months of regular use. The Boltarc brand is responsive — one verified owner noted that a problem was resolved immediately with a replacement unit.
This trimmer beats every other pick on runtime by a wide margin (120 min vs 60 min for the BeautFirst or 30 min for the LPSUK). However, the 10-inch cutting width means more passes across the lawn. For a medium-to-large property, the trade-off is worth it — you never stop to swap batteries.
Runtime king: If your yard is large or you hate mid-job battery swaps, this is the most capable trimmer in the lineup. The 10-inch cut is the only real compromise.
Best for: Large lawns, overgrown patches, and anyone who wants to trim without watching the battery gauge.
skip it if: You need the widest possible cutting path for speed — the 10-inch swath is noticeably tighter than the 13-inch LPSUK.
4. ALSO GO 21V Cordless Weed Wacker
The fastest motor in the group, bundled with a decade’s worth of spare line.
This trimmer runs a 9,500 RPM motor — the highest speed in this roundup — and backs it with two 2.0Ah batteries. That speed translates to noticeably cleaner cuts through thick grass and stubborn weeds. The 12-inch cutting width is the practical balance, giving you good coverage without losing maneuverability around flower beds. The package includes ten spare spools of 1.4mm trimmer line, which is easily a year or two of replacement line for most homeowners.
Owners universally praise the lightweight feel (5.27 lbs) and the simple controls. The 2-in-1 head rotates 90° to switch from trimming to edging, and the auxiliary handle adjusts 180° for comfort. Battery life is solid — enough for a full yard on a single charge, according to owner reports. The pale yellow color is distinctive and easy to spot if you set it down in tall grass.
Compared to the seemingly identical VIBOGEN 21V below (same weight, same battery size), the ALSO GO offers a faster motor (9,500 vs 9,000 RPM) and comes with many more spools. The VIBOGEN edges ahead on price by a few dollars, but the ALSO GO delivers noticeably better cutting speed and long-term value.
Why It Wins on Value
- Fastest motor at 9,500 RPM cuts cleaner than comparable trimmers
- Ten spare spools — no need to buy line for a year or more
- Lightweight and easy to maneuver for extended sessions
The Fine Print
- 2.0Ah batteries provide moderate runtime; not ideal for very large lawns
- Some owners at 6’4″ find the shaft a bit short
- Auto-feed system can occasionally release too much line at once
A smart buy if: You want the fastest cutting speed available under $100 and hate buying replacement spools.
Not the best fit if: You need maximum battery endurance — the 2.0Ah packs are modest compared to the 5.0Ah in the BeautFirst.
5. OKIE HOME 12-Inch Battery Powered Weed Wacker
A well-rounded performer with the most owner praise in its class.
This is the most-reviewed trimmer in this lineup, and the feedback is overwhelmingly positive. The 9,000 RPM motor provides fast, reliable cutting through grass and light weeds. Each 2.0Ah battery delivers roughly 30–40 minutes of runtime under typical use, and the dual-battery system means you can swap and keep going for about an hour. The 12-inch cutting width is efficient without being unwieldy.
What owners single out most is the thoughtful extras: the kit includes safety glasses, gloves, and multiple replacement spools. The auto-feed system advances the line automatically each time you start the motor, and there is also a manual release button that extends the line in 0.4-inch increments — a rare backup feature at this price. The detachable shaft folds for compact storage. Weighing only 5.27 lbs, it is specifically designed to be comfortable for seniors and smaller users.
Compared to the KOMASTY 20V below, the OKIE HOME offers roughly double the runtime (60–80 min total vs 30 min total) and includes better accessories. The only complaint from a minority of shorter owners is that the handle can feel slightly awkward at first, but most adjust quickly.
Owner-trusted pick: Of all the trimmers here, this one has the strongest consensus from real buyers — it just works, it is comfortable, and the battery life holds up over time.
Reach for this if: You want the safest mid-range choice with proven owner satisfaction and useful accessories included.
Consider another if: You absolutely need a 13-inch cutting width or a single 5.0Ah battery for maximum runtime.
6. HEINPRO Cordless String Trimmer (for DeWalt 20V)
The trimmer that plays nice with your DeWalt 20V battery collection.
This is the only trimmer in the roundup that ships without a battery — and that is its secret weapon. It is specifically designed to run on DeWalt 20V MAX batteries, which means if you already own DeWalt power tools, you add a trimmer without adding another charging ecosystem. The weight is just 4.2 lbs, making it the lightest trimmer on this list by a full pound or more. The 12-inch cutting width is paired with a dual-action feed system: automatic release on startup or manual button press for precise control.
Owners highlight the smooth edger wheel that lets you roll along sidewalks and driveways for clean, professional-looking edges. The handle rotates 180° and the cutting head adjusts to five different positions, so you can trim at the most comfortable angle. Six pre-wound spools (0.055-inch diameter, 16.5 feet each) are included. The market feedback is strong — with functionality and quality being the most commonly praised aspects.
If you do not own DeWalt batteries, this trimmer is not for you — you would need to buy batteries and a charger separately, which pushes the total cost well over $100. But for existing DeWalt users, this is the most cost-effective way to get a capable cordless trimmer.
Why DeWalt Owners Love It
- Lightest trimmer in the roundup at just 4.2 lbs
- Compatible with DeWalt 20V MAX batteries — no new charger needed
- Precise dual-action line feed with auto and manual modes
- Included edger wheel for clean sidewalk borders
Who Should Pass
- Battery and charger not included — not a complete kit
- Single-line spool cuts less aggressively than dual-line competitors
- Less powerful than some dedicated trimmers with integrated batteries
Best for: DeWalt 20V tool owners who want to add a trimmer to their existing battery family at minimal extra cost.
Not for: Anyone starting from scratch — you will need to factor in battery and charger costs.
7. KOMASTY 20V Electric Weed Wacker
Folds smaller than any other trimmer — lives in a closet or apartment corner.
The defining feature here is the 180° folding shaft that collapses into three sections for vertical storage in tight spaces — garages, closets, even under a bed. That flexibility is rare in a cordless trimmer at any price. The 9,500 RPM motor matches the fastest unit in this roundup, delivering gas-like cutting power through a 12-inch swath. Two 2.0Ah batteries provide a combined 30 minutes of runtime, which is enough for small-to-medium yards.
Owners describe it as lightweight, quiet, and effective for garden maintenance. The auto-feed system dispenses line automatically—just release and re-press the trigger if the line breaks. The pivoting head switches between trimming and edging without needing a tool. One practical note from shorter buyers: at 5’3″ the shaft feels borderline usable, so taller users will find it more comfortable.
Compared to the OKIE HOME above, the KOMASTY is more portable and has the same fast motor speed, but its total runtime is significantly shorter (30 min vs 60–80 min). The folding design is a genuine space-saver that no other pick matches.
Apartment-friendly trimmer: If storage space is tight, this folds down smaller than a broom. The runtime is modest, so keep it for small yards and touch-ups.
Grab this if: You live in a condo, apartment, or have a crowded garage where every inch matters.
pass on it if: You have a quarter-acre or larger lawn — the 30-minute total runtime will force a mid-job recharge.
8. VIBOGEN 21V Weed Wacker
A capable entry-level trimmer for the smallest yards and tightest budgets.
The VIBOGEN trims at 9,000 RPM with a 12-inch cutting swath — the standard specs for this price tier. Two 2.0Ah batteries deliver roughly 15–20 minutes of runtime each, which is about 30–40 minutes total. One verified owner measured it at around 40 minutes per battery under moderate use. That is enough for a small yard or for keeping edges tidy between deeper cuts. At 5.3 lbs, it is easy to handle for short sessions.
The 2-in-1 design switches between trimming and edging by rotating the head. Assembly is tool-free, and the split shaft stores compactly. The kit includes two batteries and a charger, so it is a complete package from the start. The low noise and vibration-free operation make it neighbor-friendly in residential areas. Buyers consistently note it handles standard grass and moderate weeds well, though it is not designed for heavy brush.
Where it falls short compared to the ALSO GO or the BeautFirst is runtime — 15–20 minutes per battery is modest, and you will need to swap batteries to finish anything beyond a tiny lawn. The plastic build has drawn a few complaints about durability over time. Still, for the price, it is the most accessible entry point into cordless trimming.
Why It Makes the List
- Lowest entry price in the roundup — the easiest way to go cordless
- Lightweight and quiet, ideal for residential neighborhoods
- Complete kit with two batteries and charger included
The Budget Trade-Offs
- 15–20 minutes per battery means frequent swaps for larger lawns
- Plastic construction feels less durable than mid-range competitors
- Best suited for light grass and touch-ups, not heavy weed clearing
Ideal for: A first-time buyer with a small city yard or balcony garden who wants the lowest possible cost of entry.
Step up if: Your lawn is larger than a few hundred square feet — the runtime gap to the BeautFirst is dramatic (60 min vs 30–40 min total).
Understanding the Specs
Battery Capacity (Ah) and Runtime
Battery capacity is measured in amp-hours (Ah), and it directly determines how long you can trim. A 5.0Ah battery holds roughly 2.5 times the energy of a 2.0Ah battery. But total runtime also depends on how many batteries come in the box — two 2.0Ah batteries give you about 4.0Ah of total capacity. When comparing trimmers, look at the total combined Ah and the typical minutes per battery reported by real owners, not just the voltage number.
Motor Speed (RPM)
Revolutions per minute (RPM) measures how fast the trimmer head spins. Most trimmers under $100 run between 8,000 and 9,500 RPM. Higher RPM generally means cleaner cuts through thick grass and weeds, but it also consumes battery faster. the balance for this price range is 9,000 to 9,500 RPM — enough power without draining the pack too quickly.
Auto-Feed vs Manual-Feed Line Systems
An auto-feed system releases trimmer line automatically when the motor starts or when the line gets too short. It is convenient but can waste line if the system is poorly calibrated. A manual or bump-feed system gives you control — you bump the head on the ground to release more line. Some trimmers now combine both; an auto mode for normal use and a manual button for when you need a quick extension.
Cutting Width and Weight
The cutting width (measured in inches) determines how much grass you cover per pass — wider is faster but heavier. A 12-inch cutting swath is the standard for this price tier, while a 13-inch swath is a meaningful upgrade. Weight matters because you will hold the trimmer for 20–60 minutes. Most cordless trimmers in this range weigh between 4.2 and 5.5 lbs, with lighter units being noticeably more comfortable for seniors and smaller users.
FAQ
How long does a cordless string trimmer battery actually last under $100?
Can I use my existing power tool batteries with these trimmers?
Is a higher RPM motor always better for trimming?
How do I know if a 12-inch or 13-inch cutting width is right for me?
Will a trimmer under $100 handle thick weeds and overgrown grass?
Is auto-feed line better than bump-feed?
How heavy is too heavy for a cordless string trimmer?
Do these trimmers come with extra trimmer line or spools?
Final Thoughts: The Verdict
If you want one dependable pick, the cordless string trimmer under $100 winner is the BeautFirst 12-Inch because its two 5.0Ah batteries deliver over 60 minutes of runtime — more than any other trimmer at this price except the Boltarc — and the adjustable head, lightweight feel, and reliable auto-feed make it the most complete package. If you want the widest cutting swath for speed, grab the LPSUK 13-Inch. And for marathon trimming sessions without battery swaps, the Boltarc 21V with its 120-minute total runtime is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gardening Beyond earns from qualifying purchases. This does not affect which products we feature.