Best Battery String Trimmer with Auto Feed
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If you want the best battery string trimmer with auto feed, start with the auto feed itself. Each listing uses its own wording for a system that releases fresh line during use, so you do not have to stop and tap the spool. This guide covers eight battery trimmers whose listings state an automatic or auto line feed. Four were read live on 2026-10-22, three come from stored records dated 2026-10-11, and one kit’s listing text was saved on 2026-10-22. Six of the eight also name a 2-in-1 or 3-in-1 function, and one is sold as a tool only. Check the battery, cutting width and weight lines before you buy, since the listings differ.
Quick answer
- If you own no battery, choose a listing that includes one. The EGO ST1623T title says a battery and charger are included, and the 21V 2-in-1 title lists two 2.0Ah batteries with a fast charger.
- If you already own a DEWALT 20V MAX battery, the tool-only trimmer is the match, since its listing says the battery and charger are not included.
- Auto feed wording differs by brand. EGO calls its feature LINE IQ, the DEWALT-compatible trimmer lists an Auto Feed that releases line each time it starts, and most of the others say automatic line feed.
- Most listings state a 12-inch cutting width. EGO states a 16-inch swath, and Glenvera gives both 12 inches and a 16-inch swath, so check its figure before you plan a job.
Garvee cordless string trimmer with auto line feed (B0FXQRRX1J)
The Garvee trimmer comes with two 2.0Ah batteries, and its title names an Auto Line Feed. The listing gives a 6500 RPM motor and a 12-inch cutting swath, and it describes an adjustable head with a built-in guide wheel for edges.
| Spec | What the listing says |
|---|---|
| Battery | two 2.0Ah batteries |
| Charger | not stated in the text we read |
| Feed | Auto Line Feed (title) |
| Motor | 6500 RPM |
| Cutting width | 12-inch cutting swath |
| Runtime | over 40 minutes (the listing says) |
| Head and handle | adjustable cutting head, built-in guide wheel, 180 degree adjustable auxiliary handle |
| Weight | not stated |
| Warranty | not stated |
Why it is on the list: it is one of two titles here that name the auto feed, and it gives the battery count and motor speed in the same listing. Skip it if you need the charger named, since the listing text we read does not name one. The over 40 minutes runtime is the listing’s own figure, and the listing does not say what load it assumes.
EGO POWER+ 16-inch cordless trimmer with LINE IQ (B09RND55QM)
EGO’s ST1623T is sold with a battery and charger, according to its title. The LINE IQ bullet describes auto-sensing technology that monitors and feeds the trimmer line for a 16-inch cutting swath. A separate POWERLOAD feature winds the line at the push of a button, and the shaft is a telescopic carbon fiber design.
| Spec | What the listing says |
|---|---|
| Battery and charger | included (title) |
| Battery capacity | not stated in the text we read |
| Feed | LINE IQ auto-sensing feed |
| Line loading | POWERLOAD winds the line at the push of a button |
| Cutting width | 16-inch cutting swath |
| Runtime | up to 60 minutes (listing) |
| Shaft | telescopic carbon fiber |
| Weight | not stated |
| Warranty | not stated |
Why it is on the list: its listing names an auto feed and a separate line-loading feature in the same product, and it states a 16-inch swath, the widest cutting figure in this set. Skip it if you want to compare battery capacity, since the text we read does not give amp-hours. The up to 60 minutes runtime is a listing figure with no stated load.
DEWALT 20V MAX compatible trimmer, tool only (B0HCNKSC7X)
This trimmer is a bare tool built for DEWALT 20V MAX batteries, and the listing says the battery and charger are not included. It describes a 12-inch cutting diameter, an 8500 RPM no-load speed and a dual feed setup: an Auto Feed that releases line each time the tool starts, and a Manual Feed button for extending the string.
| Spec | What the listing says |
|---|---|
| Battery | compatible with DEWALT 20V MAX; battery not included |
| Charger | not included |
| Feed | Auto Feed releases 0.4 inch of line each time the tool starts; Manual Feed button extends the 0.055 inch string |
| Cutting diameter | 12-inch |
| No-load speed | 8500 RPM |
| Spools | 6 replacement line spools included |
| Functions | string trimmer, in-line wheeled edger, mini lawn mower |
| Weight and warranty | not stated |
Why it is on the list: it is the only tool-only trimmer in this set, which matters if you already own a DEWALT 20V MAX battery. Skip it if you do not own that battery, because nothing in the box powers it. The listing does not say how the Auto Feed handles thicker line.
21V 2-in-1 cordless trimmer with auto-feed (B0HH8QLXX5)
This 21V trimmer is sold with two 2.0Ah batteries and a fast charger, according to its title. The listing describes a head that rotates 90 degrees for edging and tilts from 0 to 90 degrees, a 9500 RPM motor and a 12-inch cutting path. It names an automatic line feed and includes 10 spools.
| Spec | What the listing says |
|---|---|
| Battery | two 2.0Ah batteries (title) |
| Charger | fast charger (title) |
| Feed | automatic line feed system |
| Motor | 9500 RPM |
| Cutting path | 12-inch |
| Head | rotates 90 degrees for edging; tilts 0 to 90 degrees |
| Spools | 10 included |
| Weight and warranty | not stated |
Why it is on the list: it is one of two titles here that name the auto feed, and it lists the battery pack, charger and spools together. Skip it if you already own a battery from another line, because the listing does not name a compatible battery platform. The 9500 RPM and 12-inch path are listing figures, and the listing does not say what grass or load they assume.
Heywork 20V 12-inch trimmer with automatic line feed (B0HCNLDWJH)
The Heywork trimmer comes with two 20V 4.0Ah lithium-ion batteries and a dedicated charger, according to its listing. It describes an automatic line feed system that releases new line when the old line wears short, and it lists 8 pre-wound spools. The listing gives a weight of 6.3 lbs.
| Spec | What the listing says |
|---|---|
| Battery | two 20V 4.0Ah lithium-ion batteries |
| Charger | dedicated charger included |
| Feed | automatic line feed system |
| Motor | 8000 RPM |
| Cutting width | 12 (spec line, no unit given) |
| Weight | 6.3 lbs |
| Spools | 8 pre-wound replacement spools |
| Warranty | not stated |
| Model | G-DC2505-HY |
Why it is on the list: it names the same two-battery 20V pack as the Glenvera listing, and it gives a weight and a spool count in plain figures. Skip it if you need a stated warranty, since the listing does not give one. The cutting width line has no unit, so the 12 here is read as inches from the title.
RAXONE 21V 2-in-1 trimmer with automatic line feed (B0HFJCZDT6)
RAXONE’s trimmer is listed with an automatic line feed, two 2.5Ah batteries and a fast charger. The head rotates 90 degrees for edging and tilts from 0 to 90 degrees. The listing gives an item weight of 6.2 pounds and a 9500 RPM motor.
| Spec | What the listing says |
|---|---|
| Battery | 2 x 2.5 Ah batteries |
| Charger | fast charger included |
| Feed | automatic line feed system |
| Motor | 9500 RPM |
| Cutting width | 12 inches |
| Head | rotates 90 degrees; tilts 0 to 90 degrees |
| Weight | 6.2 pounds (item weight) |
| Model | HG0556-CRE |
| Warranty | not stated |
Why it is on the list: it gives a battery capacity figure in the bullets and an item weight, both of which some listings leave out. Skip it if you want the battery platform named, since the listing does not name one. The title says 21V, but the battery line gives only amp-hours, so the pack voltage is read from the title alone.
Glenvera 20V 2-in-1 trimmer with automatic line feed (B0HL7NF8KM)
The Glenvera trimmer comes with two 20V 4.0Ah batteries and a charger, according to its listing. Its bullets describe an automatic line feed, a motor reaching up to 9,000 RPM and a 4-position adjustable head. The listing gives an item weight of 6 pounds.
| Spec | What the listing says |
|---|---|
| Battery | two 20V 4.0Ah batteries and a charger |
| Feed | automatic line feed system |
| Motor | up to 9,000 RPM |
| Cutting width | 12 inches (spec line); 16-inch cutting swath (bullet). The two listing figures disagree. |
| Runtime | up to 60 minutes (listing) |
| Head and handle | 4-position adjustable head; 180 degree rotating handle |
| Weight | 6 pounds (item weight) |
| Model | YD2505 |
| Warranty | not stated |
Why it is on the list: it describes the same two-battery 20V pack as the Heywork listing, so it is the closest comparison on battery. Skip it if you need one cutting width figure to plan a job, since the two listing figures do not match. The runtime figure is the listing’s own, with no load stated.
Greenworks 24V trimmer and blower kit with auto-feed (B0GKFXYBBW)
Greenworks sells this 24V 12-inch brushless trimmer as a kit with a 270 CFM brushless leaf blower. The listing describes an auto-feed system that keeps line feeding during use, a 0.065-inch single line and a trimmer weight of 4.08 lbs without battery. The title names a 2.0 Ah battery.
| Spec | What the listing says |
|---|---|
| Battery | 2.0 Ah (title) |
| Charger | 30W USB-C charger (listing) |
| Feed | auto-feed system |
| Cutting path | 12 inch (listing) |
| Line | 0.065-inch single line |
| Weight | 4.08 lbs without battery |
| Blower | 270 CFM brushless leaf blower included in the kit |
| Warranty | 3-year warranty for both tools |
Why it is on the list: it is the only kit in the set, so it fits a reader who wants a blower too. Skip it if you do not need a blower, since the kit adds one. The captured listing text does not say whether the battery is in the box, so check that line before you buy.
Side by side, the eight listings state the following. Where a listing is silent, the cell says not stated.
| Trimmer | Feed as stated | Battery and charger | Cutting width | Weight |
|---|---|---|---|---|
| Garvee | Auto Line Feed (title) | two 2.0Ah batteries; charger not stated | 12-inch swath | not stated |
| EGO ST1623T | LINE IQ auto-sensing | battery and charger (title); capacity not stated | 16-inch swath | not stated |
| DEWALT-compatible | Auto Feed each start | none; battery not included | 12-inch diameter | not stated |
| 21V 2-in-1 | automatic line feed | two 2.0Ah and fast charger (title) | 12-inch path | not stated |
| Heywork | automatic line feed system | two 20V 4.0Ah and dedicated charger | 12 (no unit) | 6.3 lbs |
| RAXONE | automatic line feed system | 2 x 2.5 Ah and fast charger | 12 inches | 6.2 pounds |
| Glenvera | automatic line feed system | two 20V 4.0Ah and a charger | 12 inches and 16-inch swath | 6 pounds |
| Greenworks kit | auto-feed system | 2.0 Ah (title); 30W USB-C charger | 12 inch | 4.08 lbs without battery |
Two calculations come out of this table. Heywork and Glenvera both list two 20V 4.0Ah batteries. Voltage times amp-hours gives 80 watt-hours per battery, so the pair is 160 watt-hours, which is the same figure for both. The listings do not state the load that would use that energy, so the number does not tell you how long either trimmer runs. The three trimmers with a weight line in this table fall between 6 and 6.3 pounds, a spread of 0.3 pound. The Greenworks figure is without battery, so it is not on the same basis and should not be subtracted from the others.
If your next question is line replacement, our guide to Ryobi One Plus weed eater string covers that side. If you are weighing EGO against another brand, Greenworks and EGO Power+ string trimmers compares the two.
How we chose
The search for the keyword reported 205 results, and the first page showed 16 items. We read the trimmer listings on that page whose text names an automatic or auto line feed, and we reused stored records for three more trimmers that were already on file from a 2026-10-11 scan. We read four listings on 2026-10-22 and reused the saved text for the Greenworks kit. The criteria were these: the listing must be a battery string trimmer, the listing must name an automatic or auto line feed, and the specs in each table must be the ones the listing states. We left out string spools, hair trimmers, and listings whose text names no auto feed. A 3-in-1 kit with a mower deck was left out, because its main product is a mower. Nothing here is ranked, because the sources do not compare the trimmers on the same ground.
What we could not verify
- Runtime. The over 40 minutes figure for Garvee and the up to 60 minutes figures for EGO and Glenvera are the listings’ own numbers. None of the listings says the load or grass condition behind them.
- How each auto feed behaves with thicker line. Only the DEWALT-compatible listing gives a line diameter of 0.055 inch, and only the Greenworks listing gives 0.065 inch.
- Whether a battery in this set fits another brand’s trimmer. Each listing names its own battery line, and none of them names a shared platform.
- Which trimmer suits a given weed type, yard size or edge.
What the sources do not say
- The charger that comes with Garvee, and the amp-hour rating of the EGO battery. Neither is in the text we read.
- Weight for the Garvee, EGO, DEWALT-compatible and 21V 2-in-1 listings. Those listings give no weight in the text we read.
- Warranty length for Garvee, EGO, Heywork, RAXONE, Glenvera, the DEWALT-compatible trimmer and the 21V 2-in-1. Only the Greenworks kit states a warranty, which is 3 years for both tools.
- Replacement spool sizes for every model, apart from the 0.055-inch line of the DEWALT-compatible trimmer and the 0.065-inch line of the Greenworks kit.
FAQ
What does auto feed mean on a string trimmer?
The listings use the term for a system that releases a short length of line during use, so you do not stop to tap the spool. The DEWALT-compatible listing describes its Auto Feed as releasing 0.4 inch each time the tool starts. The EGO listing describes LINE IQ as auto-sensing technology that monitors and feeds the line. The mechanisms differ, so read each listing’s wording.
Do I need to buy a battery with a tool-only trimmer?
Yes, if you do not already own one. The DEWALT-compatible listing says the battery and charger are not included, and it names DEWALT 20V MAX batteries as the match. Check that battery line against the label on the batteries you own before you order.
Is a 12-inch or a 16-inch cutting width better?
Most listings here state 12 inches, and EGO states a 16-inch swath. A wider swath covers more ground on each pass. The listings do not show how long each trimmer takes to clear a given area, so the width figure is one input, not the whole answer.
Why do the Glenvera figures disagree?
The Glenvera listing gives 12 inches in its spec line and a 16-inch cutting swath in its bullet text. Both figures appear on the same page, and the listing does not explain the difference. Treat the cutting width as uncertain until the seller or manufacturer confirms it.
How much energy do two 20V 4.0Ah batteries hold?
The Heywork and Glenvera listings both state two 20V 4.0Ah batteries. Voltage times amp-hours gives 80 watt-hours per battery and 160 watt-hours for the pair. That figure describes the battery packs only. The listings do not give runtime for a set load, so the energy number does not tell you how long either trimmer runs.
Can I use a battery from another brand?
Only if the listing names it. The DEWALT-compatible listing names DEWALT 20V MAX batteries, and the other listings name their own battery lines. Do not assume that a battery from one line fits a trimmer from another.
Bottom line
Pick the trimmer whose listed battery line matches the batteries you already own, and confirm that its listing states an auto feed. If you own no battery, choose a listing that includes a battery and charger in the box, such as the 21V 2-in-1 or the EGO ST1623T.
Sources
- Garvee String Trimmer Cordless – Weed Wacker Battery Powered Electric Weed Trimmer with 2×2.0Ah Batteries, 12″ Grass Cutter Auto Line Feed (opened 2026-10-22) https://www.amazon.com/dp/B0FXQRRX1J
- EGO POWER+ 16″ Cordless Weed Trimmer with Battery and Charger – ST1623T (opened 2026-10-22) https://www.amazon.com/dp/B09RND55QM
- Cordless Weed Wacker Compatible with DEWALT 20V Max Battery, Tool Only (opened 2026-10-22) https://www.amazon.com/dp/B0HCNKSC7X
- 21V Electric Weed Wacker, 2-in-1 Cordless String Trimmer with 2 x2.0Ah Batteries, 12″ Auto-Feed Grass Cutter & Lawn Edger with Fast Charger (opened 2026-10-22) https://www.amazon.com/dp/B0HH8QLXX5
- Greenworks 24V 12 in String Trimmer & 270 CFM Blower Combo, 2.0 Ah Battery (opened 2026-10-22) https://www.amazon.com/dp/B0GKFXYBBW
- 20V 12″ Cordless String Trimmer, Electric Weed Wacker & Edger (opened 2026-10-11) https://www.amazon.com/dp/B0HCNLDWJH
- 21V Cordless String Trimmer & Edger with 2.5Ah Battery & Fast Charger (opened 2026-10-11) https://www.amazon.com/dp/B0HFJCZDT6
- 20V 12″ 2-in-1 Cordless String Trimmer & Electric Lawn Edger (opened 2026-10-11) https://www.amazon.com/dp/B0HL7NF8KM
