What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
The best battery string trimmer for most homeowners in 2026 is the EGO Power+ ST1623T, thanks to its 16-inch swath, automatic line feed and long runtime, while Milwaukee M18 FUEL owners, Ryobi 40V owners and anyone fighting dense weeds are usually better served by the models below that match the batteries they already have or the vegetation they actually cut.
Battery trimmers have closed most of the gap with small gas trimmers. The questions that decide a good purchase now are less about raw power and more about platform, line size, weight with the battery fitted and whether the head is easy to reload. This guide focuses on those factors.
As an Amazon Associate we earn from qualifying purchases at no extra cost to you.
Quick Picks
- Best overall for homeowners: EGO Power+ ST1623T (56V, 16-inch, LINE IQ auto-feed, telescoping carbon fiber shaft)
- Best for existing Milwaukee users: Milwaukee M18 FUEL string trimmer with QUIK-LOK (attachment capable)
- Best value with attachments: Ryobi 40V HP Brushless carbon fiber trimmer
- Best for heavy weeds: DeWalt 60V MAX FLEXVOLT 17-inch trimmer (DCST972)
- Best dealer-serviced premium option: Stihl FSA 80 R
Spec Comparison
Figures below are typical manufacturer or widely published specs for each tool. Weight with battery depends on which pack you fit, so treat it as a range.
| Model | Platform | Cutting swath | Line size | Approx. weight with battery | Typical price range (kit) |
|---|---|---|---|---|---|
| EGO ST1623T | 56V | 16 in | 0.095 in | 11-13 lb | $250-$350 |
| Milwaukee M18 FUEL QUIK-LOK | 18V | 16 in | 0.080-0.095 in | 11-13 lb | $300-$400 |
| Ryobi 40V HP Brushless carbon fiber | 40V | 15-16 in | 0.080-0.095 in | 12-13 lb (6Ah) | $200-$300 |
| DeWalt 60V FLEXVOLT DCST972 | 60V | 17 in | 0.080-0.095 in | 12-14 lb | $300-$400 |
| Stihl FSA 80 R | 36V AK/AP | 14-16 in | 0.080-0.095 in | 9-11 lb | $300-$450 |
Why These Five
EGO Power+ ST1623T
The ST1623T stands out because of how little attention it asks of the user. LINE IQ automatically feeds line as it wears, and the POWERLOAD head winds new line by pressing a button rather than hand-winding a spool. The carbon fiber shaft telescopes, which helps tall and short users find a neutral posture. Independent head-to-head comparisons have repeatedly found it among the longest-running trimmers in its class on a 4.0Ah or 5.0Ah pack. The trade-off is a proprietary head design, which limits third-party line and head swaps.
Milwaukee M18 FUEL with QUIK-LOK
If your garage is already full of red batteries, this is the obvious choice. It runs on the same M18 packs as drills and impact drivers, and the QUIK-LOK coupler lets the power head drive an edger, hedge trimmer, pole saw or brush cutter attachment. Power is excellent on an 8.0Ah or larger HIGH OUTPUT pack; on a small 2.0Ah drill battery, runtime is short and the tool feels underpowered, so plan on a big pack.
Ryobi 40V HP Brushless Carbon Fiber
Ryobi’s 40V HP trimmer delivers most of what the premium brands offer at a lower kit price. The carbon fiber shaft keeps the bare tool under 9 lb, and the attachment-capable versions accept Ryobi’s Expand-It heads. Published long-run figures with a 6.0Ah battery exceed one hour of continuous trimming. The plastic auxiliary handle is the part most often criticized for durability.
DeWalt 60V MAX FLEXVOLT DCST972
With a 17-inch swath and 60V platform, this is the trimmer for overgrown fence lines, ditch banks and thick weeds. It accepts heavier 0.095-inch line and has the headroom to keep it spinning in dense growth. FLEXVOLT batteries also run DeWalt’s 20V tools, which matters if you already use DeWalt for building work.
Stihl FSA 80 R
Stihl’s homeowner-premium trimmer is lighter than most of the field and comes with dealer setup and service. It shares batteries with other Stihl AK and AP tools. It is not the cheapest route, but buyers who value a local service counter often prefer it.
Match the Trimmer to Your Yard
| Your situation | What to prioritize | Best fit |
|---|---|---|
| Under 1/4 acre, mostly edging along beds and walks | Light weight, easy reloading | Ryobi 40V HP or Stihl FSA 80 R |
| 1/4 to 1 acre with fences and trees | Runtime, 16-inch swath, auto-feed | EGO ST1623T |
| Already own M18 or FLEXVOLT batteries | Platform compatibility | Milwaukee M18 FUEL or DeWalt DCST972 |
| Rough acreage, ditch banks, tall weeds | Heavy line, 17-inch swath, power | DeWalt DCST972 |
| Want one power head for many tasks | Attachment system | Milwaukee QUIK-LOK or Ryobi Expand-It |
Runtime Math: How Big a Battery You Need
A practical rule is that a brushless trimmer on a medium setting draws roughly 150 to 250 watts in normal grass and more in thick weeds. Battery energy in watt-hours is volts multiplied by amp-hours:
- EGO 56V x 4.0Ah = 224 Wh, enough for roughly 45-60 minutes of mixed trimming
- Ryobi 40V x 6.0Ah = 240 Wh, similar to the EGO pack
- Milwaukee 18V x 8.0Ah = 144 Wh, around 30-40 minutes depending on speed setting
- Milwaukee 18V x 2.0Ah = 36 Wh, often under 15 minutes
Most suburban lots need 15 to 30 minutes of trimming per week, so a 4.0Ah-class pack on a 40V or 56V system covers a typical yard with margin. If you also run a blower from the same battery, buy a second pack rather than a single oversized one so one can charge while the other works.
What Wears Out and What It Costs
- Line: The main consumable. A 1-lb spool of 0.080 or 0.095 line lasts most homeowners a full season. Trimming against concrete and chain-link burns it much faster.
- Bump knob and eyelets: These wear from tapping on hard surfaces. Replacement parts are inexpensive and swapping them takes minutes.
- Guard and blade cutter: The line-cutting blade on the guard dulls over a few seasons, leaving line too long and overloading the motor.
- Batteries: Lithium packs generally last several hundred cycles. Storing them half-charged in a cool, dry place over winter extends their life more than anything else you can do.
Common Buying Mistakes
- Choosing a platform for one tool. The battery is the expensive part. Pick the trimmer that fits the system you will build around for mowers and blowers.
- Judging weight without the battery. Bare-tool weight can hide 2 to 4 lb of pack. Compare kit weight.
- Running thin line in heavy weeds. Line under 0.080 inch breaks constantly in tough growth. Step up to 0.095 if your trimmer supports it.
- Ignoring head reloading. A head that is painful to rewind is the most common reason people dislike an otherwise good trimmer.
FAQ
Is a battery string trimmer as powerful as gas?
Top 56V and 60V models match a typical 25cc consumer gas trimmer for homeowner work. Gas still wins for all-day commercial use or very large rough properties without spare batteries.
Do I need a brushless motor?
Yes, for anything beyond a small lot. Brushless motors run longer per charge and hold speed better under load, and they are now standard on every model listed here.