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 pack that dies halfway down the fence line leaves the back half of the yard uncut. The fix is simple: buy a pack that lists your trimmer’s model code and holds its charge. This guide covers the packs worth trusting, what the amp-hour numbers really mean, and which one fits the way you work — whether you are edging a small city yard or running a trimmer across an acre.
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.
You will see packs with different amp-hour ratings, different weights in hand, and very different ideas about price-to-runtime. Every pick below is a genuine Worx Power Share-compatible battery, so the only job left is matching one to your tools. The trick to the best worx weed eater battery is buying for the runtime and weight you will actually use every weekend.
Top Picks
How To Choose The Best Worx Weed Eater Battery
Your trimmer does not care about brand hype. It cares about three things: whether the pack physically clicks in, how long it runs, and how heavy it feels after ten minutes of edging. Get those right and the second half of your yard gets trimmed without a recharge break.
Match the model numbers before anything else
A replacement pack only works if its listing names your tool. Worx trimmers show up as WG151, WG155, WG251, WG255, WG261, WG163, WG170 and WG545 among others, and most quality listings print these codes plainly. Check your trimmer’s model plate once, then buy only a pack that lists it. That single check prevents nearly every “it doesn’t fit” return.
Amp-hours decide how much fence line you finish
Amp-hours (Ah) measure how much energy a pack holds — think of it as the size of the fuel tank, not the power of the engine. A 3.0Ah pack and a 6.0Ah pack both push the same 20 volts to your trimmer, but the 6.0Ah one keeps going roughly twice as long before it needs a charger. Bigger is not automatically better, though, because the extra cells add weight you will feel in the handle.
Weight in the handle matters more than you think
A trimmer is held out and away from your body, so every ounce in the battery is a lever you fight all afternoon. Loads under about 1.5 pounds are easy to swing for a full session. Packs near 2.2 pounds are a fair trade if you are cutting a large property and would rather carry a heavier pack than walk back for a spare.
The charger bundle is often the smarter buy
If you already own one pack, buying a battery-plus-charger kit gives you a second pack and a way to top both up at once. Several kits here include a 2-amp charger that reports output of 20V/2A, and one lists a 25-minute charge time. A spare pack plus a charger turns a dead battery into a thirty-second swap.
Side-by-Side Comparison
| Model | Best For | Capacity | Weight | Battery Count | Amazon |
|---|---|---|---|---|---|
| WORX WA3674.J 4.0Ah★ Best Overall | Factory-fresh replacement for any Power Share tool | 4.0Ah | 1.5 lb | 1 | Amazon |
| TenHutt 6.0Ah LEDLongest Runtime Pack | Longest single-pack runtime for a trimmer | 6.0Ah | 1.2 lb | 1 | Amazon |
| LUMMINA 3.0Ah + ChargerBest Starter Combo | First-time buyers who need both pieces | 3.0Ah | 16 oz | 1 + charger | Amazon |
| 2Pack 4.0Ah WA3520 | Two-pack value for multi-tool households | 4000mAh | 1.8 lb | 2 | Amazon |
| WA3742 Starter Kit 3.0Ah | Fastest turn-around with a 2A charger | 3000mAh | — | 1 + charger | Amazon |
| Energup 3.5Ah Kit | Most complete starter bundle | 3.5Ah | 600 g | 2 + charger | Amazon |
| Bakipante 2-Pack 6.5Ah | Big-property trimming without a recharge | 6500mAh | 1.1 lb | 2 | Amazon |
| Bakipante 2-Pack 6.0Ah + Charger | All-in kit for a shed full of Worx tools | 6.0Ah | — | 2 + charger | Amazon |
| WORX WA3678.J 8.0Ah | The longest single charge you can buy | 8.0Ah | 2.2 lb | 1 | Amazon |
Detailed Reviews
1. WORX 20V 4.0Ah Lithium-ion Battery 1 pc, WA3674.J
Our pick — 4.5+★ from 350+ verified ratings; the strongest balance of quality and price.
The one that slots into every Worx tool you own without a compatibility gamble.
Buy this if you want a factory pack and zero surprises. It is the genuine WORX Power Share PRO battery, model WA3674.J, rated at 4.0Ah (amp-hours, a measure of how much charge it holds) and 20 volts, so it clicks into all Worx 20V, 40V and 80V cordless tools, outdoor power equipment and lifestyle products inside the Power Share line. That is the whole reason it takes the top spot: you are not translating model numbers or hoping a third-party listing matches your trimmer.
Runtime is the number that matters on a trimmer. Worx states the 4.0Ah pack delivers 2.0x the runtime of a traditional 2.0Ah battery, which for most suburban yards means you finish the fence line and the edging in one go rather than walking back for a spare. The pack also carries an intelligent battery management system that tunes individual lithium-ion cells, plus thermoplastic material that keeps them cooler for longer. A 360° cell protection layer guards against vibration and impact, which matters on a trimmer because the tool shakes constantly through a cutting session.
What separates it from cheaper replacements is the small stuff. A charge-level indicator tells you what is left before you head out, and a push-button release lets the pack drop out of the tool in one motion. It weighs 1.5 pounds, which is light enough to swing for a full session. The honest catch: battery-life feedback on this one is genuinely split, with some buyers finding it holds up fine and others reporting it will not hold a charge. Value also splits opinion. If you want the lowest possible spend, a replacement pack further down this list stretches further per battery — but the worst case on a genuine pack is a warranty conversation with Worx, not a compatibility argument with a no-name seller.
Why it slots in first
- Genuine Worx Power Share PRO battery, compatible across the 20V, 40V and 80V line
- 4.0Ah delivers 2.0x the runtime of a 2.0Ah pack
- Charge-level indicator plus push-button release
- 1.5 pounds — easy to hold on an edging pass
Where it gets debated
- Battery-life reports split between reliable and not holding charge
- Costs more per pack than the replacement options below
Buy it for: confidence and a true factory fit across every Worx tool on your shelf.
Think twice if: you trim rarely and would rather spend less for a spare-rotation setup.
2. Worx 20V Replacement Battery
Six amp-hours on a trimmer means one charge covers the whole yard, not half of it.
Here is the head-to-head that matters: this pack holds 6.0Ah versus the 3.0Ah bundled in the LUMMINA kit, so it carries twice the energy for a single cutting session. On a weed eater that difference is the gap between finishing the back fence and stopping to hunt for a charger. The listing names the trimmer codes directly — WG154, WG162, WG163, WG170, WG261, WG801 and the WG252.9 among them — plus blowers, chainsaws, pole saws and Landroid mowers, so you can confirm your model before you buy.
The built-in 3-LED display is the feature you will actually use every weekend. Three lights show roughly how much charge is left, so you know before you start whether the edging will get finished. A quick-release button drops the pack out of the tool fast, and the maker states the cells support up to 1,000 charge cycles with a power management system guarding against overcharging, over-discharging, over-voltage, over-current and overheating. The PC+ABS casing is built to take knocks in a shed or a truck bed.
What wins people over is fit and raw power — the pack seats properly in Worx mowers, trimmers and edgers, and buyers report getting more edging done per charge. Weight is the counterweight: at 1.2 pounds this big-capacity pack stays surprisingly light in the handle, lighter than the 1.8-pound two-pack below. One thing to know: it is a replacement battery, not a Worx-branded pack, so if your trimmer is a Worx Nitro model, confirm compatibility on the listing before committing.
Runtime math that decides it: 6.0Ah against a 3.0Ah pack is double the tank on the same 20-volt tool — the single biggest jump in this list short of the 8.0Ah pack.
The trade-off to accept: third-party branding means you check your own model number rather than relying on the Worx badge.
Reach for this if: you run one trimmer hard and want the longest single-charge session at a sensible mid-tier spend.
Look elsewhere if: you want a genuine Worx pack or own a Nitro tool.
3. WORX 20V Battery and Charger
A pack and a charger in one box, for the buyer who owns neither yet.
If you picked up a bare Worx trimmer with no battery, this is the sensible starting point. You get a 3000mAh, 20-volt lithium-ion pack plus a charger that accepts 110–240V input and outputs 20V, and the listing states a 1.5-hour charge time. The pack is built to the same size as the original, so it drops into Worx 20V tools and chargers without modification. Buyers point to it working with weed eaters and leaf blowers, and say it lasts as long as the original battery.
Functionality is the thing everyone raves about here, and it makes sense for a combo — both halves have to work for the buyer to be happy, and they do. The charger reads as quick, the fit is right, and the pack holds up through regular cutting. The maker notes the shell is high-strength plastic and held up in a 1.5-meter drop test. Practical care rules are worth following: do not leave the pack on the charger past three hours, and store it somewhere clean, dry and cool away from heat and metal.
What you actually get: a 3000mAh pack plus a 20V-output charger with a 1.5-hour recharge — enough for most small-to-mid yards in one rotation.
Set your expectations: 3.0Ah is half the capacity of the 6.0Ah pack above, so plan on charging between longer sessions.
Ideal for: first-time Worx owners who need a working battery and charger together.
Keep shopping if: you already have a charger and only want a higher-capacity pack.
4. 2Pack WA3520 Battery Replacement
Two 4.0Ah packs, so one always sits charged while the other runs.
The count is the whole pitch. This listing gives you two batteries where the genuine WORX WA3674.J gives you one — so if your shed has a trimmer and a blower, you can keep both fed without swapping a single pack between tools. Each one is rated 4000mAh at 20 volts, lithium-ion, and works as a replacement for WA3520, WA3525, WA3575 and WA3542, fitting the WG151, WG155, WG251, WG255, WG540, WG890 and WG891 series. It is also listed as compatible with the WA3847 quick charger and the WA3732 charger.
The integrated microchip is what keeps these packs safe across a season of use — it guards against overdischarge, overload and short circuit, and the cells are built without a memory effect so you can top up whenever. The listing notes CE, FCC and RoHS certification and a 1-year warranty. What wins people over is battery quality: these packs earn stronger credibility than anything else on the listing, with value a close second.
Now the honest bit. At 1.8 pounds each, these are the heaviest 4.0Ah option here — versus 1.5 pounds for the genuine WORX pack — so the tool feels more nose-heavy on long edging runs. Battery life also splits, with some finding they outlast the original and others reporting a pack that will not hold a charge. The practical take: stagger your use, keep both cycled, and the two-pack setup makes a dud far less painful than it would be with a single battery.
What earns the shelf space
- Two 4.0Ah packs — double the batteries of a single genuine pack
- 4000mAh at 20V, fits WA3520, WA3525, WA3575 and WA3542
- Microchip guards against overdischarge, overload and short circuit
- CE, FCC and RoHS certified with a 1-year warranty
Where it gives ground
- 1.8 pounds per pack makes the trimmer noticeably heavier
- Mixed reports on holding a charge over time
Made for: households running two or more Worx tools that want a spare always on standby.
Not the one if: you trim with one tool and feel every extra ounce.
5. Replacement 20V Battery and Charger WA3742 Starter Kit
A 25-minute listed charge time is the number that turns a dead pack into a quick turnaround.
The standout spec here is speed. The listing states a 25-minute charge time from a 20V/2A charger, which is the quickest recharge figure on this list — shorter than the 1.5-hour LUMMINA combo and the 60-minute Energup kit. That is a 3000mAh, 20-volt pack paired with the fast charger, and it replaces charger models WA3732, WA3742, WA3875 and WA3847. Compatible tools run across the WG151, WG155, WG251, WG255, WG540, WG890, WG891, WG184, WG261, WG324, WG545.6, WG584, WG644 and WG779 series.
What buyers care about most is that both halves simply work — the charger does its job, the pack powers the tool, and people say they would buy it again. The charger is small and light and carries an LED indicator so you can see charging status at a glance. The pack itself uses A-grade cells with a microchip that guards against overheating, overloading and overcharging, and it ships with CE, FCC and RoHS certification.
The thing to weigh: 3000mAh is a modest tank for a trimmer, so the fast charge is doing heavy lifting in this kit. You get back out quickly, but you will be back at the charger sooner than with a 6.0Ah pack. Also note the 2A charger is a replacement, not an OEM piece, so plug it in and confirm the light behavior on your first cycle.
Fastest loop on the list: a stated 25-minute charge from a 20V/2A charger against a 1.5-hour combo makes this the quick-turn pick.
The real limit: 3000mAh means more frequent charging than the higher-capacity packs.
Pick this if: you cut in short bursts and want the shortest wait between sessions.
Skip if: you need a full-yard runtime from a single pack.
6. Energup Worx 20V Battery and Charger Kit
Two 3.5Ah packs plus a charger — the fullest kit here for starting from scratch.
This is the bundle to buy if you want batteries and a charger in one shot. You get two 3.5Ah packs and a portable charger, and the listing states a 60-minute charge time. It is built with a hard limit worth checking first: it does not fit the WA3674 battery or a Nitro trimmer WG173, and it is not for Worx Nitro 20V or 40V tools. Fits standard Worx trimmers in the WG151, WG155, WG251, WG255, WG540, WG890 and WG891 families, and replaces chargers like WA3732, WA3742 and the WA3847 quick charger.
What wins people over is battery quality, and value runs a close second — two packs in the kit make the value case easier. Each 3.5Ah pack carries a charge indicator and charges quickly, and the maker describes the cells as lightweight so the tool stays manageable in hand. The charger shows status clearly: green flashing on standby, solid red while charging, solid green when full. CE, FCC and RoHS certification sits behind the safety hardware.
The caveat worth knowing: inserting and removing the charger takes some effort, so treat the connector gently and do not yank it. Battery life draws split feedback — some find the packs last longer in use, others find they lose charge. One buyer’s note that rings true for anyone stacking two packs: two batteries together are what make 40 volts, so a single pack alone will not run a 40V tool. A 13-month warranty and 45-day return window back the kit.
Why the bundle makes sense
- Two 3.5Ah packs plus a charger with a 60-minute charge time
- Fits standard Worx trimmers across the WG151, WG155, WG251, WG255 and WG540 families
- Clear LED status: flashing green standby, solid red charging, solid green full
- 13-month warranty and 45-day return window
Know before you buy
- Will not fit the WA3674 battery or Worx Nitro tools
- Charger connector needs a firm, careful push
The smart buy for: anyone who wants two packs and a charger bundled together.
Wrong fit if: you run a Nitro tool or own a WA3674 pack.
7. 2-Pack 6.5Ah Battery Compatible with Worx 20V Battery WA3575
Two of the highest-capacity packs here, without the single-pack price.
Here is the number that settles the argument: 6.5Ah in each pack, two packs in the box, and the maker states each delivers 3 times the runtime of a standard 2.0Ah battery. For a trimmer that means far fewer trips back to the charger and far more fence line per session. It fits WA3575, WA3525, WA3578, WA3520, WA3671, WA3674 and WA3669 batteries, and is listed as compatible with 20V/40V tools from lawnmowers and chainsaws to trimmers, drills and blowers — two packs together give you 40 volts. It works with the WA3875, WA3742 and WA3881 chargers.
Weight is the surprise. Even at this capacity the packs weigh around 1.1 pounds, so the tool stays balanced in hand through a long cutting session. Each pack has a 3-light LED indicator so you can see what is left, and the no-memory-effect cells can be topped up whenever without losing capacity. Safety hardware covers incorrect voltage, overcharging, over-discharging, over-current and short-circuiting, and the packs carry CE, FCC and RoHS certification. They seat well on trimmers and mowers and recharge on standard Worx chargers.
What buyers mention first is how well these work with trimmers specifically, which is exactly the tool this list is built around. The trade-off is one to be aware of: it is a 2-pack kit, not a single, so the up-front outlay is higher — the payoff comes in never stopping mid-yard again.
The long-game pick: 6.5Ah per pack with two in the box means most yards get finished on one pack with a charged spare waiting.
Budget your spend: this is a larger single purchase than a one-pack option, even though the per-battery value lands well.
Runs best for: larger properties and multi-tool households that want serious runtime and a spare.
One to skip if: a single pack already covers your whole yard.
8. 2Pack 20V 6.0Ah Kit Compatible with Worx 20V Battery WA3669
Two 6.0Ah packs and a dual-port charger that tops both up at once.
The thing that earns its place is the charger, not just the batteries. This kit packs two 6.0Ah packs and a dual-port charger that replaces the WA3875, so you can charge two packs at the same time instead of queuing them. Each pack is triple the capacity of the original 2.0Ah battery, so a trimmer runs noticeably longer between charges. Fits WA3669, WA3674, WA3525, WA3520, WA3512, WA3512.1, WA3575, WA3578 and WA3742 batteries, with a 2-hour listed charge time.
What wins people over is battery life — that 6.0Ah rating is the headline for anyone cutting a real yard. Build quality and value both rate well, and the maker backs the kit with 30-day refund and 365-day limited assurance. The packs are integrated with microchip protection against overcharge, over-current and over-voltage, and carry CE, FCC and RoHS certification. No memory effect means you can charge to full every time without degrading capacity.
Compatibility draws the only mixed signal — the kit works across the standard Worx 20V and 40V tool range, but not every Worx tool is covered, so confirm your trimmer’s model code against the listing before buying. Beyond that, the dual-port charger is the real convenience win: both packs are ready together, so a full-yard session never waits on a single charging slot.
What makes the kit work
- Two 6.0Ah packs, each triple a 2.0Ah battery’s capacity
- Dual-port charger replaces WA3875 and charges both packs at once
- Microchip protection against overcharge, over-current and over-voltage
- 30-day refund and 365-day limited assurance
The honest caveats
- Compatibility is not universal across every Worx tool
- 2-hour listed charge time is slower than the 25-minute kit above
Built for: a shed full of standard Worx tools that wants both packs charged and ready.
Check first if: your trimmer model is not clearly listed under compatibility.
9. WORX 20V 8.0Ah Lithium-ion Battery, WA3678.J
The biggest tank Worx makes — for yards that eat smaller packs alive.
When runtime is the whole job, this is the answer. Worx rates this pack at 8.0Ah and states it provides up to 4X the run time of traditional 2.0Ah batteries. For a weed eater that means the whole property gets trimmed on a single charge. It is the genuine Power Share PRO battery, so it fits all Worx 20V and 40V tools, outdoor power equipment and lifestyle products with no compatibility guesswork. The charge-level indicator lets you check before you head out.
Inside, the intelligent BMS (battery management system) tunes individual lithium-ion cells to lift power, performance and run time. Thermoplastic material keeps those cells cooler for longer, which is why a big pack holds up through a full cutting session without sagging. A 360° cell protection layer guards against vibration and impact from a trimmer that never stops shaking. It is a serious piece of kit and the reviews back the runtime — owners describe getting deep into a session on a single charge.
The weight is the honest side of the deal: at 2.2 pounds this is the heaviest pack on the list, versus 1.5 pounds for the 4.0Ah WA3674.J, so the trimmer feels more front-heavy. Some buyers debate whether the cost is justified, and quality gets mixed signals. If you cut a small yard, the 4.0Ah genuine pack is the better-balanced choice — the 8.0Ah is for the trimmer that runs long and the yard that keeps needing more.
The runtime ceiling: 8.0Ah at up to 4X a 2.0Ah pack’s run time is the longest single charge this list offers.
What you carry for it: 2.2 pounds in the handle and a premium price — real weight and real spend for real runway.
The pick for: large properties and heavy trimming that go through packs fast.
Pass on it if: a small yard makes the extra weight and spend go unused.
Know the Specs
Amp-Hours (Ah) and Milliamps (mAh)
Amp-hours measure how much charge a battery holds — the fuel-tank size. A 4.0Ah pack and a 4000mAh pack are the same thing; 1000 milliamps equals 1 amp. Ratings you will see here run from 3000mAh up to 8.0Ah. On a weed eater, a 6.0Ah pack roughly doubles the runtime of a 3.0Ah pack, so pick by how long your cutting session runs, not by the biggest number on the shelf.
Voltage and Power Share Compatibility
Every pack on this list feeds 20 volts to the tool. Worx Power Share tools run on one 20V pack, or two together for 40V tools. That is why model compatibility matters more than brand: a pack must list your trimmer’s code, such as WG151, WG255 or WG261, to be sure it seats. A pack that lists your trimmer’s code is worth more than a slightly bigger one that does not click in.
Common Questions
Will a 6.0Ah pack replace the 2.0Ah battery in my Worx trimmer?
How do I find my Worx trimmer’s model number?
Does a bigger Ah number mean more cutting power?
Are third-party replacement batteries safe for my Worx tool?
How long should I leave a replacement battery on the charger?
Can I use these batteries in a Worx Nitro trimmer?
What is the difference between the 4.0Ah and 8.0Ah genuine Worx packs?
Do replacement batteries need a special charger?
Why does my new battery not hold a charge as long as expected?
Should I buy one big pack or two smaller ones?
The Bottom Line
For most people, the worx weed eater battery to trust is the WORX 20V 4.0Ah WA3674.J because it is the genuine Power Share PRO pack — it clicks into every Worx 20V, 40V and 80V tool, weighs 1.5 pounds, and delivers 2.0x the runtime of a 2.0Ah battery with no compatibility gamble. If you want the longest single-charge session without stepping up to the top tier, go with the 6.0Ah TenHutt pack, which doubles the capacity of the starter kits. And for the trimmer that runs long on a large property, the WORX 8.0Ah WA3678.J is the one to reach for — eight amp-hours and up to 4X the run time of a 2.0Ah battery.
How we choose
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
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of November 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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