Best 20V 12” 2-in-1 Cordless String Trimmer
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Anyone searching for the best 20V 12 2-in-1 cordless string trimmer mostly wants to know what comes in the box. This page compares six 20V-labelled, 12-inch listings from saved scans. Five include two batteries and a charger. The WORX WG163.9 is a bare tool with neither. The Glenvera YD2505 and the Heywork list two 4.0Ah packs, the largest batteries in the set, and only the Glenvera states a runtime, up to 60 minutes. Every runtime and speed figure below is the seller’s claim, copied from the listing.
Quick answer
- Five of the six listings include two batteries and a charger. The WORX WG163.9 is a bare tool, and its battery and charger are not included.
- Battery size is the clearest difference. The Glenvera and Heywork listings describe two 4.0Ah packs. The WORX WG163, KOMASTY and SUNCHERS listings describe two 2.0Ah packs.
- Listed runtimes are seller claims: about 30 minutes for the KOMASTY and SUNCHERS kits, up to 60 minutes for the Glenvera kit, and no figure for the WG163 or the Heywork.
- None of the six saved listings states a warranty term, and the KOMASTY and SUNCHERS listings state no weight. Check the live listing for both before you buy.
What the battery numbers mean
A battery listing gives a voltage and an amp-hour (Ah) rating. Multiplying them gives a rough energy figure in watt-hours (Wh), and dividing that energy by a listed runtime gives the average power draw the claim implies. The table below uses only that arithmetic on the numbers printed in each listing. It says nothing about how long a pack lasts on thick grass.
| Listing | Battery kit as listed | Nominal energy, two packs | Runtime claim in the listing | Implied average draw |
|---|---|---|---|---|
| WORX WG163 | 2 x 2.0Ah | 80 Wh (two packs of 40 Wh) | Not stated | Cannot be worked out |
| KOMASTY | 2 x 2.0Ah | 80 Wh (two packs of 40 Wh) | Up to 30 minutes in total (bullet) | 160 W |
| SUNCHERS | 2 x 2.0Ah | 80 Wh (two packs of 40 Wh) | About 30 minutes together (bullet) | 160 W |
| Glenvera YD2505 | 2 x 4.0Ah | 160 Wh (two packs of 80 Wh) | Up to 60 minutes (bullet) | 160 W |
| Heywork | 2 x 4.0Ah | 160 Wh (two packs of 80 Wh) | Not stated | Cannot be worked out |
| WORX WG163.9 | None included | Not applicable | Not applicable (bare tool) | Not applicable |
Formula: energy in Wh equals volts times Ah times the number of packs, and implied draw in watts equals Wh divided by the runtime in hours. The KOMASTY and SUNCHERS claims (80 Wh in half an hour) and the Glenvera claim (160 Wh in one hour) all work out to 160 W, so the Glenvera’s 60 minutes is what twice the stored energy gives at the same draw. That is arithmetic on three seller claims. None of the three states the grass height or load behind its figure, and the Heywork lists the same 4.0Ah packs as the Glenvera but no runtime, so the calculation cannot be run for it.
Read the 160 Wh rows as a way to compare kits, not as a promise of cutting time. For the same battery labels on a different tool type, see our guide to lawn mower battery voltage and amps.
The six models at a glance
Every model in this set gives a 12-inch cutting width in its title or specs. The table gives the rest as each listing states it. Where a figure appears only in a bullet, the table says so. The listings that ship with batteries and give a weight do not say whether the packs are counted in it.
| Listing | Cutting width | Speed | Weight | Included with the listing |
|---|---|---|---|---|
| WORX WG163 | 12 inches | 7,600 rpm | 5.5 lb | Trimmer, two 2.0Ah batteries, charger, safety guard, flower guard, edger wheel, spool, spool caps |
| KOMASTY | 12 inches | 9,500 rpm | Not stated | Trimmer, two 2.0Ah batteries, charger |
| Glenvera YD2505 | 12 inches (title and specs) | Up to 9,000 rpm (bullet) | 6 lb | Trimmer, two 4.0Ah batteries, charger, eight pieces of spool line |
| Heywork | 12 inches | 8,000 rpm | 6.3 lb (bullet) | Trimmer, two 4.0Ah batteries, dedicated charger, eight pre-wound spools |
| SUNCHERS | 12 inches | 9,500 rpm | Not stated | Trimmer, two 2.0Ah batteries, charger, eight spools, two spool caps |
| WORX WG163.9 | 12 inches | 7,600 rpm | 4.6 lb (tool as listed) | Trimmer only. Battery and charger not included. |
Model notes
WORX WG163: two 2.0Ah packs and the most named accessories
The WG163 is a 2-in-1 trimmer and edger. Its listing states two 2.0Ah batteries and a charger. The specs and a bullet agree on the 5.5-pound machine weight. The listing names a safety guard, a flower guard, an edger wheel, a spool and spool caps, which is more named accessories than any other listing in this set. A bullet describes a 90-degree tilting head for edging and sloped ground, and a push-button command feed for line. The bullets give a line diameter of 0.065 inch and a line length of 10 inches, and it is the only listing here that states a line diameter.
The bullets also say the two packs can be used on any other tool in the WORX Power Share family. That is the seller’s statement. Check the manufacturer’s compatibility list before you buy a second tool for the same pack. View on Amazon
KOMASTY: a folding 2-in-1 with a 30-minute claim
The KOMASTY kit is two 2.0Ah batteries and a charger. The spec table and bullets agree on the 9,500 rpm speed. The bullets say the two packs give up to 30 minutes of total runtime, and the spec table repeats the 30 minutes. The shaft folds 180 degrees for storage, the head adjusts up to 90 degrees, and the handle rotates 180 degrees. The listing describes the tool as designed for small yards and tight spaces and includes an automatic line feed. A bullet advises against cutting excessively thick or dense grass to prevent line breakage, another advises keeping the cutting head parallel to the ground, and another advises letting the batteries cool for a few minutes before recharging. The listing gives two different model numbers, so this page leaves both out.View on Amazon
Glenvera YD2505: two 4.0Ah packs and a 60-minute claim
The Glenvera listing is titled “20V 12” 2-in-1 Cordless String Trimmer & Electric Lawn Edger.” It names Glenvera as both brand and manufacturer, gives model number YD2505 (the manufacturer part number field repeats it), and lists the color as yellow. The title and the specification table give a 12-inch cutting width, and this page uses that figure. The bullets give two 20V 4.0Ah batteries and a charger, the specs list the batteries as included, and the item highlight agrees on the 4Ah packs. The bullets claim up to 60 minutes of runtime and coverage of up to 1/4 acre on a single charge. Neither claim states the grass height or cutting conditions behind it.
The head has four positions, the handle rotates 180 degrees, and a button switches between trimming and edging. The listing has an automatic line feed that, in its words, keeps the cutting line at the optimal length during use, but it does not say how the line is fed or how often. The bullets present the cordless design as freedom from cords and outlets. The item dimensions field gives 9.5 inches long by 7 inches wide with no height, so ask the seller for the assembled length before you plan storage.
The quarter-acre claim can be turned into a travel distance. A quarter acre is 43,560 square feet divided by 4, or 10,890 square feet. Formula: travel in feet equals area in square feet divided by the width in feet. At the 12-inch width from the spec table, covering that area takes at least 10,890 feet of travel with no overlap. Spread over the 60-minute claim, that is 181.5 feet per minute, or about 2.1 miles per hour (10,890 feet per hour divided by 5,280 feet per mile). Overlap, turns and stops add travel, so the pace the claim needs is higher than that. The listing does not say what ground the quarter-acre figure assumes. View on Amazon
Heywork: two 4.0Ah packs with no runtime figure
The Heywork kit is two 20V 4.0Ah lithium-ion batteries and a dedicated charger, and the item highlight agrees on the two 4Ah packs. The spec table and a bullet agree on the 8,000 rpm speed. The listing states no runtime figure. It says only that the larger packs give longer runtime. The kit includes an automatic line feed and an adjustable grip, and the trimmer switches between trimming and edging. The battery entry in the spec table does not match the bullet text, so this page uses the bullets and the item highlight.View on Amazon
SUNCHERS: a foldable 2-in-1 with about 30 minutes
The SUNCHERS kit is two 2.0Ah rechargeable batteries and a dedicated charger. Its spec table and bullets both give 9,500 rpm. The bullets say the two packs deliver around 30 minutes of continuous use together, and the spec table repeats the 30 minutes. The head adjusts from 0 to 90 degrees, and the trimmer folds 180 degrees for storage. The listing has an automatic line feed and an auxiliary wheel.View on Amazon
WORX WG163.9: bare tool, battery and charger not included
This is the one model in the set that does not ship with power. Its item highlight says battery and charger not included, and its included-components field lists only the string trimmer. You must buy a battery and a charger separately, and the listing does not name a pack that fits. The bullets describe a 90-degree tilting shaft, a telescopic shaft, a command feed spool system and a rubberized twin wheel set for the edger. The pattern field says PowerShare, but no battery pack is named, so do not assume a pack you already own will fit. Check with the manufacturer first.View on Amazon
Trimming and edging: how each listing switches modes
All six listings describe an edging use, but they describe different ways to get there. Cornell’s turfgrass guide says string trimmers are typically used to trim grass and cut back weeds, and that they suit tight spaces or spots a mower cannot easily reach. Edging along a bed or path is a different cut. Utah State’s extension article on edging, dated 2003, names a spade or shovel cut 6 inches deep between bed and grass as the cost-free option and says a small scoop shovel leaves the straightest edge. It adds that the job must be repeated two or three times a year and creates more regular work than the other methods it lists. The sources here do not compare a powered edger with a spade, so the table below reports only what each seller says about the switch.
| Listing | How the listing says it switches to edging | Edging parts named |
|---|---|---|
| WORX WG163 | Converts from trimmer to edger “in just seconds” (bullet); head tilts 90 degrees | Edger wheel in the included components; bullets name rubberized wheels that support and guide the edger |
| KOMASTY | Adjust the pivoting head to switch between trimming and edging (bullet) | None named |
| Glenvera YD2505 | A push of a button switches between trimming and edging modes (bullet) | None named |
| Heywork | Switches between trimming and edging modes; the mechanism is not stated | None named |
| SUNCHERS | Adjust both the shaft and cutting head angles (bullet) | An auxiliary wheel |
| WORX WG163.9 | Converts to an edger in seconds (bullet); 90-degree tilting shaft | A rubberized twin wheel set is named in a bullet; the included-components field lists only the string trimmer, so this page does not say whether the wheels are in the box |
Only the WG163, SUNCHERS and WG163.9 listings name a wheel to guide the edge. The WG163 bullets alone claim that the wheels give straighter lines and cleaner cuts, and that is a seller claim.
Which kit fits which job
- If you want the most listed battery energy in this set, the Glenvera and Heywork listings both describe two 4.0Ah packs. Only the Glenvera listing gives a runtime figure.
- If you want the most named accessories and a head that tilts for edging and sloped ground, the WORX WG163 lists both.
- If you may add other WORX tools later, the WG163 bullets say its packs fit the WORX Power Share family. That is a seller statement, so confirm it with the manufacturer.
- If you need the shaft to fold for storage in a tight space, the KOMASTY and SUNCHERS listings both describe folding shafts.
- If you want one tool that switches between trimming and edging with a single button, the Glenvera listing is the only one that describes it that way.
- If you already own a 20V battery and charger and have confirmed the fit, the WG163.9 is the only bare-tool option here.
- If you want a wider path than 12 inches, none of these six fits. The DEWALT FLEXVOLT 60V MAX bare trimmer in the same scan lists a 15-inch cutting width, and our guide to the DEWALT FLEXVOLT 60V MAX string trimmer covers that platform.
For a broader comparison of two trimmer platforms, read our Greenworks and EGO string trimmer comparison. For a closer voltage match from another brand family, our Black and Decker cordless weed eater guide for 20V tools covers another 20-volt trimmer in the same class.
Before you order
- Confirm that the batteries and charger are in the box you receive, because a listing states them but a seller can ship a different kit. The WG163.9 should show none.
- Ask for the warranty document, since the saved listings give no term to read.
- If cutting width decides your choice, ask the seller to confirm it in writing, since one Glenvera bullet words the width differently from its title and specs.
- Check the assembled and folded length against your storage spot, remembering that the Glenvera dimensions field gives no height.
- Compare the runtime claim with your longest trimming session, and plan a spare pack if the job runs longer.
Safety and handling
String trimmers can throw debris, and the university guides we opened say so. Virginia Tech’s lawn care training guide advises eye and ear protection when operating power tools, and it advises keeping bystanders, children and pets out of a 50-foot radius. It recommends long pants, closed-toe shoes and gloves, and it says not to remove protective guards or string guides. The same guide notes that automatic-feed and bump-feed trimmers may release more string than needed. The Ohio State fact sheet on handheld trimmers recommends safety glasses with side shields or goggles when using cutting attachments, and it advises being aware of bystanders when objects are thrown.
Cornell lists string trimmers among the most dangerous lawn and landscaping tools. It advises checking the ground for loose debris such as glass, metal and small stones, wearing long sleeves, long pants, closed-toed shoes, gloves, eye protection and ear protection, and avoiding loosely draped clothing that the spinning head could catch. Oklahoma State adds that trimmers and edgers can damage tree trunks, landscape plants, house trim and fences, and it advises reading the operator’s guide before using any lawn tool.
Battery and charger handling follow the same logic. The University of New Hampshire’s lithium battery guidance advises storing packs in a cool, dry area away from direct sun and temperature extremes, and keeping loose packs away from keys, coins and zippers. It warns against leaving packs in parked vehicles or enclosed spaces that can heat up. It says to charge only with the charger designed for that battery type and brand, and to plug chargers straight into a grounded wall outlet rather than an extension cord. Those guidelines were written for public works crews, so the manual for the kit you buy governs the details. For charging faults on a different tool, see our guide on a lawn mower battery that will not charge.
How we chose
The product scan holds twelve listings that came back for this keyword. We kept six that name a 20V battery, a 12-inch cutting width and a string trimmer, and we count a 2-in-1 trimmer and edger as a string trimmer. We left out a 21V model at 12 inches, a 21V model whose spec table lists an 11-inch cutting width, a model that names no voltage and lists an 8-inch width, a 40V trimmer and blower combo, a 60V bare trimmer at 15 inches, and a replacement line spool.
Every product figure in this post comes from the listing copy saved on 2026-10-12, except the WG163.9, which was saved on 2026-10-14. We did not open the live listings for this post. Where a listing contradicts itself, we used the value that its title, item highlight or matching bullet supports, and we name the source where it matters. The safety and edging guidance comes from six university pages opened on 2026-10-22 and 2026-10-29. We chose them because they cover trimmers, edgers and lithium battery handling, and they were readable when we opened them.
What we could not verify
- Runtime and coverage. Each figure, including the Glenvera quarter-acre claim, is a listing claim with no grass height, area or cutting conditions attached, and no source in this set gives a comparable number.
- Warranty. The saved listings give no warranty term for any of the six models.
- Weight. The KOMASTY and SUNCHERS listings state none, and the listings that give one do not say whether the batteries are counted in it.
- The maker. The Glenvera listing names Glenvera as brand and manufacturer, and the Heywork, KOMASTY and SUNCHERS manufacturer fields repeat the brands themselves. No manufacturer page we opened confirms any of them.
- Battery fit. The listings do not confirm which packs fit the bare WG163.9, and they do not say whether the Glenvera, Heywork, KOMASTY or SUNCHERS packs work with any other tool. The cross-tool claim for the WORX kit comes from the seller.
- Charge time, motor type and line gauge. The saved listings do not state a charge time or whether any motor is brushed or brushless, and only the WG163 gives a line diameter.
- Motor and guard design. The sources we opened cover general trimmer safety, not the motor or guard design of any model here.
- Spec conflicts. One Glenvera bullet words the cutting width differently from its title and specs, so this page uses the 12-inch figure from the title and spec table. The Glenvera and Heywork spec tables list battery entries that do not match their bullets, the SUNCHERS spec table words its battery entry differently, and the KOMASTY listing gives two model numbers. We used the bullets and highlights where they agree and left the rest out.
- Listing changes. The copy was saved on 2026-10-12 and 2026-10-14, so stock, bundles and wording may have changed. Check the current listing before you buy.
FAQ
Does each model come with a battery and charger?
Five of the six do. The WG163, KOMASTY, Glenvera, Heywork and SUNCHERS listings each include two batteries and a charger. The WG163.9 is a bare tool, so it includes neither. If you buy it, you need a battery and charger that the manufacturer lists as compatible, and the listing does not name them.
Is the cutting width really 12 inches?
All six listings give 12 inches in their title or specs. One Glenvera bullet words the width differently, and this page uses the 12-inch figure, which the Glenvera title and specs both support. Treat 12 inches as the width the seller lists, and ask the seller to confirm it if width decides your choice.
How long will one charge last?
The listings give the only figures. KOMASTY and SUNCHERS say about 30 minutes for two 2.0Ah packs. Glenvera says up to 60 minutes and up to 1/4 acre for two 4.0Ah packs. The WG163 and Heywork give no runtime figure. None of the listings states the grass height or conditions behind its number, so treat each one as a seller claim, and use the watt-hour table only to compare kits.
Can I use a battery from another brand?
The listing data does not support that. The WORX WG163 bullets say its packs work on other tools in the WORX Power Share family, which is a seller statement about one brand’s line. For any other brand, check the manufacturer’s compatibility list. Mismatched chargers are a safety concern as well. The University of New Hampshire guidance notes that off-brand or mismatched chargers may provide incorrect voltage or lack safety controls.
Can these tools edge a lawn as well as trim?
Yes, as the listings describe it. All six describe an edging use, and the table above shows how each says it switches. The Glenvera listing names a button, the KOMASTY a pivoting head, and the SUNCHERS a change of shaft and head angle. Only the WG163, SUNCHERS and WG163.9 name a wheel to guide the edge.
Who makes these trimmers?
The WORX WG163 lists Positec Technology (China) Co., Ltd. as its manufacturer, and the WG163.9 lists Positec/Worx – Lawn & Garden. The Glenvera, Heywork, KOMASTY and SUNCHERS listings each give the brand itself in the manufacturer field. We could not confirm any maker from a manufacturer page, so treat those names as the listings’ statements.
Bottom line
Decision rule: pick the kit by the longest trim you plan to do. The two 4.0Ah kits (Glenvera and Heywork) list twice the stored energy of the three 2.0Ah kits (WG163, KOMASTY and SUNCHERS), every runtime figure is the seller’s claim, and the bare WG163.9 only makes sense if you already own a battery and charger that the manufacturer lists as compatible.
Sources
- Virginia Tech Cooperative Extension, “Powered Hand Tools Safety: Lawn Care Training Guide” (Publication BSE-50P, opened 2026-10-29)
https://aaec.vt.edu/content/dam/pubs_ext_vt_edu/BSE/BSE-50/BSE-322.pdf - Ohio State University Extension, “Handheld Trimmers and Brush Cutters” (AEX-790.37, dated 11/20/2015, opened 2026-10-29)
https://ohioline.osu.edu/factsheet/aex-79037 - University of New Hampshire T2 Center, “Tailgate Talk: Lithium Battery Safety” (opened 2026-10-29)
https://t2.unh.edu/sites/default/files/media/2025-11/Tailgate%20Talk-%20Lithium%20Batteries.pdf - Beyond The Mower: Safe Use Of Trimmers, Edgers And Blowers (Oklahoma State University Extension, opened 2026-10-22)
https://extension.okstate.edu/announcements/grow-gardening-columns/2025/august-24-2025.html - Tips for Edging Your Lawn (Utah State University Extension, article dated 2003, opened 2026-10-22)
https://extension.usu.edu/archive/tips-for-edging-your-lawn - Mechanical Control (Cornell University, Turfgrass and Landscape Weed ID, opened 2026-10-22)
https://turfweeds.cals.cornell.edu/pfm/mechanical-control - Glenvera 20V 12 in. 2-in-1 Cordless String Trimmer & Electric Lawn Edger (Amazon listing, stored scan 2026-10-12)
https://www.amazon.com/dp/B0HL7NF8KM - WORX 20V 12 in. 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163 (Amazon listing, stored scan 2026-10-12)
https://www.amazon.com/dp/B018S68U40 - KOMASTY 20V Electric Cordless String Trimmer, 2 x 2.0Ah (Amazon listing, stored scan 2026-10-12)
https://www.amazon.com/dp/B0G6KMRNJ5 - Heywork 20V 12 in. Cordless String Trimmer, Electric Weed Wacker & Edger (Amazon listing, stored scan 2026-10-12)
https://www.amazon.com/dp/B0HCNLDWJH - SUNCHERS 20V Electric Cordless String Trimmer, 2 x 2.0Ah (Amazon listing, stored scan 2026-10-12)
https://www.amazon.com/dp/B0GF2334S9 - WORX 20V 12 in. 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163.9 (Amazon listing, stored scan 2026-10-14)
https://www.amazon.com/dp/B01DGPH8M8
