Best Battery String Trimmers 2026

TLDR

• Best overall: EGO Power+ ST1521S — 15-inch cut, POWERLOAD auto-wind reload, bump-feed advance, and the most mature fresh-start outdoor battery platform.
• Best for heavy weeds: DeWalt DCST972 FlexVolt — 17-inch cut, 60V power, contractor-grade durability.
• Best budget: Black+Decker LSTE525 — under $150, pivot head doubles as edger, fine for sub-1/8 acre lots.
• Best if you already own batteries: Stay in your platform unless the trimmer is truly underpowered. A second charger and orphan battery usually erase a spec-sheet win.
• Runtime rule: If trimming currently takes more than 20 minutes, buy the kit or bare tool that lets you run two batteries without waiting on a charger.

Comparison table and full picks below. The section everyone should read is the platform one — most buyers waste money by ignoring the ecosystem they already own.

Pick by the Battery Platform You Already Own

A trimmer is one of the worst tools to buy in isolation. It is cheap enough that the bare tool looks like the decision, but the real cost is batteries, chargers, spare packs, and the next three outdoor tools you add. Start here before reading another spec.

Runtime Reality: The Claim Is Not the Session

Manufacturer runtime claims are useful, but only after you translate them into your yard. EGO publishes up to 30 minutes for the ST1521S on a 2.5Ah pack. Greenworks publishes up to 50 minutes for this 80V kit with its included 2.0Ah battery. Ryobi published up to 72 minutes for the older 40V HP carbon-fiber model with a 4Ah pack. None of those numbers mean you get the same runtime while chewing through waist-high weeds at full speed.

Four things drain a trimmer faster than the box implies: high-speed mode, a wider 16- or 17-inch swath, thicker line, and wet or woody growth. Edging along concrete also feels light until you realize the line is constantly abrading on hardscape. If you are replacing a gas trimmer because your yard has a long fence line, a drainage ditch, or a back slope, budget around battery capacity first.

Battery Platforms Matter More Than the Trimmer

The single most expensive mistake in cordless outdoor tool buying is fragmenting across platforms. The string trimmer itself — bare tool — is $100-200. The battery + charger kit is the other $100-250. Fragmenting platforms means buying that second $100-250 every time you add a new tool.

If you already own an EGO mower, the EGO ST1521S is the obvious trimmer — same 56V battery, no new charger needed. If you have a garage full of DeWalt power tools, the DCST972 FlexVolt is the obvious pick because the same 60V battery runs your drill, your circular saw, and your trimmer. The trimmer's actual performance is almost a tiebreaker compared to which platform you commit to.

The Five Major Platforms in 2026

EGO 56V Power+. The most mature dedicated outdoor power equipment platform. Trimmer, mower, blower, edger, snow blower, chainsaw — all on the same 56V battery. Best ecosystem if outdoor tools are your main use case.

DeWalt 60V FlexVolt. Cross-compatible with the 20V Max line via FlexVolt batteries. If you already own DeWalt power tools, the trimmer is the obvious add. FlexVolt batteries run both your 20V drill and your 60V trimmer.

Milwaukee M18. The contractor's platform. M18 batteries power every Milwaukee tool from impact drivers to vacuums to leaf blowers. If you own Milwaukee tools for work, the M18 FUEL trimmer is the same battery you carry every day.

Ryobi 40V HP / 18V One+. Home Depot exclusive. The 40V HP line is the newer, higher-power outdoor platform; the 18V One+ is the older budget-tier line with 200+ compatible tools. Ryobi's strength is value pricing and tool variety, not raw performance.

Greenworks Pro 80V. The most affordable premium outdoor platform. Smaller ecosystem than EGO, but higher voltage means more power for the price. The right pick if you want EGO-level performance without paying EGO prices.

Line Feed and Reloads: What the Labels Actually Mean

Every trimmer cuts with nylon line that wears down as it hits grass, stems, fences, and concrete. Product pages blur two separate jobs: advancing line while trimming and reloading new line after the spool is empty. That is where buyers get misled.

Bump-feed advance (EGO, DeWalt, Milwaukee, Greenworks, Ryobi)

You tap the cutting head against the ground while the trimmer is running, which advances a small amount of line. It is not fancy, but it is mechanically simple and recoverable. When it jams, you can usually open the head, clear the tangle, and get back to work. For heavier weeds, this is still the safest default.

Push-button feed (Black+Decker EASYFEED)

Black+Decker's EASYFEED is no-bump line advance, but it is not a magic sensor that knows exactly how much line you need. You press a button to advance line. That is convenient for small-lot trimming and edging, but it is not the mechanism I would choose for ditch banks or abrasive fence-line work.

Auto-wind reload (EGO POWERLOAD)

EGO's POWERLOAD system solves the spool-winding job. Feed the replacement line through the head, press a button, and the head winds the line for you. In normal trimming, the ST1521S still uses bump-feed line advance. That distinction matters: POWERLOAD makes reloading painless, but it is not automatic line feeding during use.

Top Picks: Comparison Table

Six trimmers ranked by rating, with the specs that actually decide the purchase: cutting width, battery voltage, weight (matters for user fatigue), shaft material, and price.

Full specs in the tool catalog.

Best for Heavy Weeds: DeWalt DCST972 FlexVolt

The DCST972's 15/17-inch adjustable cutting swath and 60V FlexVolt power are the most aggressive combination in this guide. Where lighter trimmers bog in dense weed growth or thick clover, the DeWalt has the headroom you want. It is the pick for a long fence line, drainage ditch, rough back corner, or anyone who has already learned that 20V light-duty trimmers are not enough.

At 12.4 lbs with battery, the DCST972 is heavier than the EGO or Ryobi competitors. For occasional weed-whacking it is manageable. For 30+ minute continuous sessions, your shoulder will feel it. The trade-off is power, attachment capability, and the ability to run the same FlexVolt battery across 60V outdoor tools and many 20V Max tools.

Pick it over EGO when heavy growth and the FlexVolt ecosystem matter more than weight. Pick it over Milwaukee when you do not need Quik-Lok attachments but do want the wider 17-inch option. Skip it if your trimming is mostly weekly edging around beds; the extra weight is wasted there.

Best for Edges: Black+Decker LSTE525 / Add a Dedicated Edger

The Black+Decker LSTE525 has a pivot head specifically engineered for edging mode. Rotate the cutting head, switch to edging stance, and the wheel helps guide a small sidewalk or driveway edge. For a typical townhome, patio strip, or small suburban front walk, it handles the maintenance pass from one inexpensive kit.

Do not confuse that with cutting a new edge into overgrown turf. For deeper, crisper edge lines - the kind that look professional after a season of maintenance - a dedicated wheeled edger cuts cleaner than any string trimmer. See the edger category for picks.

Best Battery Platform: EGO ST1521S

The EGO 56V Power+ ecosystem is the most mature dedicated outdoor power platform on the market. The ST1521S trimmer is the entry point: 9.7 lbs with a 2.5Ah battery in our data, a 15-inch cut, bump-feed advance during trimming, and POWERLOAD auto-wind reloading when the spool is empty. That is the right combination for a fresh-start homeowner who wants one outdoor battery family.

If you already own the EGO LM2156SP mower (the top pick in our self-propelled mower guide), the ST1521S is the obvious trimmer pairing. Same battery, same charger, same case.

If you are entirely new to cordless outdoor power and do not already own DeWalt or Milwaukee tools, EGO is the platform to commit to. Mower, trimmer, blower, edger, chainsaw, snow blower - all available, all on the same 56V battery. If you already own a good DeWalt, Milwaukee, Ryobi, or Greenworks battery base, though, do not switch to EGO just for a trimmer.

Best Budget: Black+Decker LSTE525

Under $150 with batteries and charger, the Black+Decker LSTE525 is the most affordable trimmer we recommend for the right small-lot buyer. The 20V Max platform is older but enormous - replacement batteries and spools are easy to find, and the kit usually includes two small 1.5Ah batteries.

The trade-off is the 12-inch cut width, light-duty torque, and short-session battery ceiling. Our product data uses Black+Decker's listed 8.8 lb weight, so treat "lightweight" claims as small-lot ergonomics rather than a premium weight advantage. The LSTE525 will not handle dense weeds or extended sessions like the DeWalt or EGO. But for a small-lawn buyer who wants a simple trimmer that doubles as an edger, it is the rare budget pick that actually does its job.

Best for Existing EGO / DeWalt / Milwaukee Owners

If you already have outdoor batteries on one platform, the decision is mostly made. The only time I would cross platforms is when your current ecosystem cannot solve the job: a 20V light-duty trimmer on a rough lot, a non-attachment tool when you need a pole saw/edger path, or a discontinued battery family where replacement packs are painful.

EGO 56V owners: ST1521S. Light enough, powerful enough, and POWERLOAD removes the worst part of re-spooling. Buy bare tool if you already have a healthy pack.

DeWalt 20V Max / FlexVolt owners: DCST972. Same FlexVolt battery family can serve your existing 20V Max tools and this 60V trimmer. Buy it when power matters more than weight.

Milwaukee M18 owners: M18 FUEL 2825. Quik-Lok accepts attachments (edger, pole saw, hedge trimmer, brush cutter), so the power head becomes the start of an outdoor toolkit instead of a single-purpose trimmer.

Ryobi 40V HP owners: 40V HP Brushless Carbon Fiber Shaft. Good homeowner fit, Home Depot support, and the Expand-It path. Just watch exact kit/model numbers because Ryobi has several similar 40V trimmers.

Greenworks Pro 80V owners: ST80L210. Same 80V battery as the Greenworks mower/blower family, with a simple bump-feed head and strong value if you already own the packs.

When to Add a Dedicated Edger

A string trimmer can edge — rotate the head, walk the sidewalk line. But it cuts a soft, fuzzy edge rather than a crisp vertical line. For maintained residential lawns where edges are a visual feature (curb-appeal yards, formal landscaping, HOA-policed neighborhoods), a dedicated edger cuts a sharper, deeper edge and saves the string trimmer for actual trimming work.

Most homeowners do not need a dedicated edger. Everyone with one is glad they have it. If you're already buying a trimmer and want the option to add a dedicated edger later, see the edger category. The same battery platform you choose for your trimmer should drive your edger choice.

Source Notes and Spec Corrections

This guide leans on official manufacturer specs for the details that change purchase decisions: runtime claims, feed/reload language, battery compatibility, swath size, and attachment capability. The big correction: EGO POWERLOAD is an auto-wind reload feature, while the ST1521S still uses bump-feed line advance during trimming.

• EGO ST1521S: 15-inch swath, 0.095-inch line, POWERLOAD reload, bump-feed advance, and up to 30 minutes on the 2.5Ah kit battery.
• DeWalt DCST972B: 60V FlexVolt, 15/17-inch adjustable swath, universal attachment capability, 0.080 included line, and compatibility with 0.095 DeWalt line.
• Milwaukee 2825-21ST: M18 Quik-Lok power head, 14/16-inch swath, 0.080/0.095 line, Easy Load head, and M18 battery compatibility.
• Greenworks ST80L210: 80V, 16-inch cutting path, bump feed, 0.080 spiral line, and published runtime up to 50 minutes with the included pack.
• Ryobi RY40209BTL: 40V HP carbon-fiber model, 15-inch cut, Expand-It attachment capability, Reel Easy+ bump-feed head, and published runtime up to 72 minutes with a 4Ah battery.
• Black+Decker LSTE525: 20V Max, 12-inch trimmer/edger, two 1.5Ah batteries, EASYFEED push-button line advance, and wheeled edging conversion.

Frequently Asked Questions

Battery or gas for a 1/4 acre lot?

Battery. A good cordless trimmer is the easier residential answer because trimming is usually a 15-30 minute job, not an all-day engine-use job. No fuel mixing, no pull cord, no off-season carburetor work. Gas still wins for commercial crews, neglected lots, and hours of continuous cutting.

How long do trimmer batteries last in real use?

Advertised runtime is best-case guidance. EGO publishes up to 30 minutes on the ST1521S with a 2.5Ah battery; Greenworks publishes up to 50 minutes with the included 2.0Ah pack; Ryobi published up to 72 minutes with a 4Ah pack on the carbon-fiber 40V HP model. Thick weeds, high speed, wider swaths, edging on concrete, and thicker line all cut into that. If trimming takes more than 20 minutes now, plan around two batteries.

Which battery platform should I choose?

Whichever you already own, unless it is clearly underpowered for your yard. If starting fresh: EGO 56V for dedicated outdoor power, DeWalt 60V FlexVolt if you own DeWalt power tools, Milwaukee M18 if you want Quik-Lok attachments, Ryobi 40V for Home Depot value, Greenworks 80V for strong voltage-per-dollar.

Bump-feed or auto-feed?

Bump-feed is more reliable and easier to recover when something jams. EGO POWERLOAD is not auto-feed; it automatically winds new line during reload, then uses bump-feed during trimming. Black+Decker EASYFEED is push-button advance. Heavy work: bump-feed. Tiny yard convenience: EASYFEED is fine.

Can a string trimmer replace a dedicated edger?

For maintaining an existing edge, yes - especially the Black+Decker LSTE525 with its pivot head. For cutting a new, crisp, deep edge, a dedicated wheeled edger cuts cleaner. Most homeowners do not need a dedicated edger; everyone with one is glad they have it.

What cutting line should I use?

Most residential trimmers ship with 0.080-0.095 inch line. For heavy weeds, switch to 0.105 inch. EGO and DeWalt accept up to 0.105 inch. Stay within manufacturer specs — thicker line stresses motors and shortens battery life.

Are string trimmers loud enough to bother neighbors?

Battery trimmers are quieter than gas, but still loud enough that hearing protection is smart for longer sessions. The bigger neighbor issue is the high-pitched line noise near fences, windows, and hardscape. Trim at reasonable hours.

How important is shaft material — carbon fiber vs steel vs aluminum?

Carbon fiber (Ryobi 40V HP) is significantly lighter — reduces user fatigue on long sessions. Steel and aluminum are heavier but cheaper. For weekly use on a 1/4 acre lot, you will feel the carbon fiber difference. Occasional use: tiebreaker, not decision factor.