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.
The short answer: for one pack that fits your trimmer, drill and blower with no compatibility questions, buy the official WORX 4.0Ah WA3674.J. If you want maximum runtime for the least outlay, the aftermarket 6.0Ah packs are where your money stretches furthest. The tricky part is that a Worx 20V battery is not a single product — it is a family of packs that all slide onto the same PowerShare rail, and the difference between a great one and a frustrating one is capacity, weight, and whether it genuinely holds its charge after a season of yard work.
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 exactly which packs fit which PowerShare tools, how amp-hours translate into real cutting time, and where aftermarket cells cut corners. Every pick below has been checked against the Worx 20V PowerShare rail, so you can pick one and get back to the job. This breakdown of the worx 20v battery covers nine compatible packs, their real runtimes, and the fit notes that matter before you buy.
Top Picks
How To Choose The Best Worx 20V Battery
The mistake most people make is buying on amp-hours alone and ignoring weight and charger fit. A bigger number means more runtime, but it also means more weight hanging off the back of a string trimmer, and it means nothing if the pack does not seat cleanly in your charger. Start with the tool you use hardest, then work backwards.
Match the amp-hour rating to your hardest job
Amp-hours (Ah) are the pack’s fuel tank — a 2.0Ah pack holds roughly half the energy of a 4.0Ah pack, and a 6.5Ah pack holds more still. For a drill or an impact driver, a 2.0Ah pack is plenty and keeps the tool light in your hand. For a leaf blower or a chainsaw that runs flat out, you want 4.0Ah or above or you will be walking back to the charger mid-job.
Check the PowerShare fit before anything else
Worx 20V packs slide onto the PowerShare rail, and the official packs also run 40V and 80V tools in the line. Aftermarket replacements are usually built to the same rail, but a few are explicitly not for Worx Nitro 20V/40V tools, and none of them fit the older 18V tools. Read the compatibility list on the pack you are eyeing and match it to the model number stamped on your tool.
Weigh the official pack against the aftermarket
Official Worx packs carry the intelligent battery management system and the 360° cell protection that the brand builds in. Aftermarket packs counter with more capacity for the money, plus their own protection chips and drop-test claims. If your tools are your livelihood, the official pack’s battery management system and 360° cell protection make it the safer bet. If you are a weekend yard warrior, an aftermarket pack with a two-year replacement warranty does the job for less.
Side-by-Side Comparison
| Model | Best For | Capacity | Pack Count | Weight | Amazon |
|---|---|---|---|---|---|
| WORX 20V 4.0Ah WA3674.J★ Best Overall | All-round yard and shop use | 4.0Ah | 1 | 1.5 lb | Amazon |
| Supowill 20V 6.0AhBest Runtime Value | Long runtime on a budget | 6000mAh | 1 | 1.7 lb | Amazon |
| Powilling 6.5Ah WA3575Highest Capacity | Chainsaw and heavy cutting | 6500mAh | 1 | 1.4 lb | Amazon |
| BECDXPal 2-Pack 3.5Ah | Two-pack value for smaller tools | 3500mAh | 2 | 1.7 lb | Amazon |
| NEWCHUHUI 2-Pack 4.0Ah | Spare packs for the whole garage | 4000mAh | 2 | 1.8 lb | Amazon |
| Koedsion 2-Pack 3000mAh | Light-duty drilling and trimming | 3000mAh | 2 | — | Amazon |
| WORX 20V 2.0Ah WA3669.J | Compact drilling and quick top-ups | 2.0Ah | 1 | 14.08 oz | Amazon |
| Bakipante 2-Pack 6.5Ah | Big jobs across a whole property | 6500mAh | 2 | 1.1 lb | Amazon |
| Powilling 2-Pack 6.5Ah + Charger | Starting from scratch or adding a charger | 6500mAh | 2 | 16 oz | 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 official pack that doubles your runtime and fits everything on the PowerShare rail.
This is the one to buy if you want zero guesswork. It is a genuine Worx pack, so it slots into every 20V, 40V and 80V tool in the PowerShare line — the maker puts the compatible product count at 140+ — and it is the version Worx points Nitro owners toward. The capacity is 4.0 amp-hours, which this pack delivers as 2.0x the runtime of a traditional 2.0Ah battery. In plain terms, your string trimmer runs about twice as long before you go hunting for a fresh pack, and your blower finishes the driveway on one charge.
The build is where the official pack earns its keep: a battery management system that tunes each cell, a thermoplastic housing that keeps cells cooler, and 360° protection against vibration and impact. Worx packs an intelligent battery management system inside that tunes each individual lithium-ion cell for output and runtime, while the thermoplastic housing is built to keep cells cooler for longer. Add the 360° cell protection against vibration and impact and you get a pack that tolerates being dropped off the tailgate. There is a charge-level indicator on the case so you can see what is left at a glance, and a push-button release that pops the pack off the tool cleanly instead of fighting a sticky latch.
What wins people over is the power — reviewers single out the pack’s output as its standout strength, with the amp-hour doubling treated as the headline. Honest trade-off, and it is the big one: runtime consistency draws the widest spread of opinion, ranging from packs that hold a charge for days down to a pack that reportedly quit after a handful of minutes. That is a pattern common to lithium packs in general, not a reason to skip this one, but it does mean you should check the pack on arrival. Do not misread the amperage either. The listing’s “4 A” figure is the capacity rating, not a charger output.
Where it holds up
- Genuine PowerShare design works across the 20V, 40V and 80V tool range
- 4.0Ah capacity for real extended runtime
- Charge-level indicator plus push-button release
- 1.5 lb pack is easy to handle on long jobs
What to keep in mind
- Charger is not included — you need one already or to buy separately
- Some packs have shown inconsistent capacity from the start
- Official pricing runs higher than aftermarket equivalents
Buy it if: you own several Worx tools and want one official pack that works in all of them.
Look past it if: you have no Worx charger yet, since this ships as the battery only.
2. Supowill 20V 6.0Ah Replacement for WORX
An aftermarket pack that pushes capacity higher than the official 4.0Ah and still fits the same charger.
Here is the value play in plain numbers. For a blower or a mower, that extra tank means fewer charging breaks and a job that runs to the end. It is rated at 20V and works with the Worx 20V chargers by model, so you are not buying a second charging system.
The build quality is what buyers keep returning to. The consensus is that this replacement feels and behaves like the original Worx pack, right down to the fit and finish. Functionality is equally solid — the pack seats and engages without slop, and the runtime gain shows up in the tools people actually use, from trimmers to vacuums. A 1000-cycle recharge rating and a 1% self-discharge rate round out the longevity story, with a two-year replacement warranty covering you, no repair route needed.
The honest weight note: at 1.7 pounds this is heavier than the Powilling 6.5Ah at 1.4 pounds, so the extra capacity does cost you on the arm during long trim sessions.
The warranty read: two years of free replacement is generous for a pack in this class, and it covers the most common failure point — a cell that stops holding charge.
Worth the swap if: you want above-official capacity without paying official prices.
Think twice if: a trimmer is your main tool and you prefer the lightest pack you can get.
3. Powilling 6.5Ah 20V Replacement Battery WA3575
The capacity king of the aftermarket crop, and the lightest 6.5Ah pack in the group.
At 6500mAh, this pack sits at the top of the capacity ladder — Powilling rates it to run 1/3 longer than a 2.0Ah battery. It is lighter than the Supowill 6.0Ah by 0.3 pounds, which matters when the pack is riding the back of a trimmer. It is a 6.5 amp pack by rating, and it charges on the Worx WA3847 quick charger and WA3732 charger by model. The LED indicator on the side lets you see charge state before you commit to a job, so you are not caught with a flat pack halfway across the yard.
The pack shines in chainsaws and in chargers — buyers report it drops straight in and runs twice as long as the original pack. That doubled runtime claim lines up with the 1/3-longer-than-2.0Ah rating once you account for the real-load variance every tool brings. For safety, Powilling builds in over-charge, over-discharge, over-voltage, over-current and over-heating protection, and lists CE, FCC and RoHS compliance, with a 45-day money-back and 12-month warranty behind it.
What people get
- 6500mAh capacity with extended runtime in real tools
- 1.4 lb pack is light for its size
- LED charge indicator for fast status checks
- Compatible with the WA3847 quick charger and WA3732
Worth knowing before you order
- Not the official Worx pack, so Nitro compatibility is worth checking
- Warranty is 12 months rather than a longer term
Reach for this if: capacity and weight are your two priorities and you want the strongest practical runtime.
Choose the official pack instead if: you need documented compatibility with Worx Nitro tools.
4. BECDXPal 2-Pack 3.5Ah 20V Battery WA3525
Two packs, a lighter build, and a charger gap that closes in about four hours.
Two packs is the whole point here. You get a pair of 3500mAh lithium-ion batteries at 20 volts, so one can sit on the charger while the other runs your trimmer. Each pack is 770 grams, which the listing calls out as light enough to ease the arm and shoulder load on long sessions. The capacity is 3500mAh — 500mAh under the 4000mAh NEWCHUHUI pair below — so it trades a little runtime for a lighter feel.
The three-level LED readout is genuinely useful: it shows remaining charge in bands from 0 to 35%, 35 to 70%, and 70 to 100%. Instead of guessing off a single light, you get a rough percentage before you start. Charge time runs to about four hours to full from the Worx charger, and the pair is covered by a 45-day money-back plus a 12-month warranty.
The runtime trade: battery life wins the most support — it lasts a while and recharges cleanly on the Worx charger. The value case is the second draw; two packs for one order means fewer charging stops across a whole afternoon of work.
The capacity catch: 3500mAh is a middle-of-the-road tank. A heavy blower job will drain a pack faster than a 6.5Ah would, which is the price you pay for the lighter pack.
Best fit for: drill-and-driver work plus light trimming where a light pack beats a big one.
Not the pick for: full-afternoon blower sessions that need maximum capacity per pack.
5. NEWCHUHUI 2Pack 20V 4.0Ah WA3520 Battery
Two official-capacity packs for the price of one, built for a garage full of Worx tools.
This pair matches the WORX 4.0Ah WA3674.J on capacity — both sit at 4000mAh — and the 4000mAh figure also beats the BECDXPal 3.5Ah pair above by 500mAh per pack. The pack weighs 1.8 pounds, heavier than the official 1.5 lb single, so the two-pack gives you spare runtime at the cost of a bit more heft. It fits the WA3520, WA3525, WA3575 and WA3542 battery slots and works across the WG151, WG155, WG251, WG255, WG540 and WG890 tool series, plus the WA3847 quick charger and WA3732 charger.
Battery quality is the strongest signal — the consensus is that these packs match the original Worx quality and slot cleanly into the tools and chargers. Value for money is the second big draw; two packs covers a pair of tools without a single point of failure. Safety features are present too: premium cells with no memory effect, a microchip guarding against over-discharge, overload and short circuit, and CE/FCC/RoHS certification.
Capacity honesty: runtime splits opinion on these packs — some run long, a few drop off faster than expected. Lithium packs of every brand can show that spread, so check both packs soon after arrival rather than discovering it on the first big job.
The pairing logic: with two packs in the box, you cover drill and trimmer simultaneously and rotate on the charger, which is the practical way to avoid downtime.
Handy for: households with two Worx tools and one charger to share.
Skip if: you need the lightest possible single pack to swing on a trimmer all afternoon.
6. Koedsion 2Pack 3000mAh Battery Replacement
A compact pair that runs drills and trimmers without asking for a big-tank budget.
If your Worx tools are light-duty, this pairing makes the most sense. Each pack is 3000mAh, and the cells are rated for 40% longer cycle life than standard, so the pack keeps working through many charge cycles. The form factor matches the original — same size, same interface — so it drops into the WA3520, WA3525, WA3575 and WA3669 slots without any adapter. The listing is explicit about one hard limit: these do not fit 18V cordless tools.
Safety and build are where this pack puts its effort. The protection system covers short circuit, over-charge, over-discharge and high temperature, and the cells carry CE, FCC and UL specification marks. It also passed a 1.5m drop test, which spells out a pack that tolerates a fall off the workbench. Charge time is quick per the customer consensus, and it works with trimmers, weedeaters and drills. The two-pack also ships with noise-cancelling earplugs, and the warranty stretches to a lifetime technical guidance offer.
Why it earns a spot
- 3000mAh cells rated for 40% longer cycle life
- Same size and fit as the original pack
- Protection against short circuit and over-heating
- Passed the 1.5m drop test
What to plan around
- 3000mAh is the smallest capacity in this lineup
- Not compatible with 18V Worx tools or Nitro 20V/40V packs
Made for: drills, drivers and light trimming where a compact pack keeps the tool balanced.
Not for: a blower marathon — the 3000mAh tank will empty before the job is done.
7. WORX 20V 2.0Ah Lithium-ion Battery 1 pc, WA3669.J
The official lightweight pack that tops up in an hour, made for drills that stay in your hand.
Small tank, big convenience. This is the official 2.0Ah Worx pack at 14.08 ounces — the lightest pack in this lineup, and that lightness keeps a drill or driver balanced in your palm. It hits a full charge in one hour when paired with the 60-minute WA3881 quick charger or the WA3884 dual-port charger. If you already own one of those, the pack cycles fast enough to keep a tool running all morning with a single spare.
Compatibility is the usual PowerShare strength. The pack runs in all Worx 20V and 40V tools, including outdoor equipment and lifestyle products, and it works with the WA3742, WA3769, WA3881, WA3770, WA3884 and WA3835 chargers by model. The on-case charge-level indicator tells you what is left, and the push-button release drops the pack off cleanly. For build, the consensus says quality is high and it fits the full range of Worx cordless tools.
The runtime reality: 2.0Ah is a small tank. In a drill this is a non-issue. In a blower or trimmer it empties fast, and runtime opinion is split between packs that last and a few that fade inside an hour.
The fit nuance: a handful of buyers get a looser seat than they expected. It is a fit mismatch to check on arrival, not a flaw across the line.
Built for: drill and driver owners who want an official pack that recharges in a hurry.
The wrong tool for: anyone who needs a pack to run a blower from one end of the drive to the other.
8. Bakipante 2-Pack 6.5Ah Battery WA3575
Two high-capacity packs that let you run one tool while the other charges.
Two packs at 6500mAh each, at 1.1 pounds apiece — this pairing gives you the same capacity as the Powilling 6.5Ah single pack further up, but doubles the run time across your garage. Bakipante rates each pack at 3 times the run time of a standard 2.0Ah battery, and at up to 1,000 charging cycles. For a mower, chainsaw or trimmer, that is the difference between a half-done yard and a finished one. The packs run on the WA3575, WA3525, WA3578, WA3520 and WA3671 models and work with the WA3875, WA3742 and WA3881 chargers.
These are built to stay useful for the long haul. A 3-light LED indicator shows remaining power, and the protected cells guard against incorrect voltage, over-charging, over-discharging, over-current and short-circuiting. There is no memory effect, so you can top up a pack without losing capacity. The two-pack also lists CE/FCC/RoHS certification, which keeps the safety story simple.
The fit picture: owners mention these packs work well with trimmers and slot into the mower and charger without a fight. Pair the two packs with one charger and you have a rotation that keeps a tool moving all afternoon.
The one hard limit: these are not for Worx Nitro 20V/40V tools. Check your tool’s badge before ordering, because that is the one incompatibility that will send you back to the return desk.
Ideal for: a bigger property, multiple Worx tools, and no patience for charging delays.
Look elsewhere if: you run Worx Nitro tools, which this pack does not support.
9. Powilling 2 Pack 6.5Ah Battery and Charger WA3674
The full kit — two big packs and a charger — for anyone starting from an empty shelf.
This is the one bundle that removes the charging question. You get two 6500mAh packs plus a WA3881 charger replacement, with the charger taking 100-240V AC input and putting out 20V DC at 2A. It also supports wall mounting, so you can hang it out of the way and keep the bench clear. Each pack weighs 16 ounces, and the pair covers WA3674, WA3578 and WA3525 batteries plus tools like the WG170, WG184, WG320 and WG322 by model. Note it is not for Worx 18V tools.
The housing is built to survive the drops and knocks that come with garage use — an ABS+PC shell on both battery and charger. Inside, a smart chip covers overcharge, short-circuit and over-temperature protection. The three-level LED reads out from 0 to 35%, 35 to 70% and 70 to 100%, so you can see exactly where a pack sits. The 6500mAh cells push runtime well past a standard pack, and the battery-and-charger kit means you are not hunting for a separate charger at checkout.
What the kit brings
- Two 6500mAh packs plus a wall-mountable WA3881 charger
- ABS+PC shell on battery and charger for drop resistance
- Three-level LED charge readout
- Smart chip protection against over-charge and over-temperature
Before you commit
- Not compatible with Worx 18V tools
- A charger replacement, not the official Worx charger
Best when: you need batteries and a charger together and want one order to cover both.
Already have a charger and: you can save a step by buying the packs alone.
Know the Specs
Amp-Hours (Ah) and Milliamp-Hours (mAh)
These are two ways of saying the same thing. One amp-hour equals 1000 milliamp-hours, so a 6.5Ah pack is the same as a 6500mAh pack. The number is the pack’s fuel tank: a 4.0Ah pack holds about twice the energy of a 2.0Ah pack, which is why Worx describes its 4.0Ah pack as 2.0x the runtime of a 2.0Ah battery. The trade-off is weight — bigger tanks mean heavier packs, which you feel on a trimmer long before you feel it on a drill.
PowerShare Compatibility
PowerShare is the mounting rail all Worx 20V, 40V and 80V tools share, so one pack slides into a mower, a drill or a blower. Official Worx packs run the full line. Aftermarket replacements are built to the same rail but vary in what they support: some are not for Worx Nitro 20V/40V tools, and none fit the older 18V tools. Match the model list on the pack to the model number on your tool before you buy.
Common Questions
Will an aftermarket replacement pack fit my Worx 20V charger?
Does a 6.5Ah pack last longer than the official 4.0Ah pack?
Why does my pack say 4 A amperage?
Will these packs work in Worx Nitro tools?
Can I use a Worx 20V pack in an 18V tool?
How long does a full charge take?
Is it safer to buy the official Worx pack?
What do the LED charge indicators actually show?
Do these packs have a memory effect?
What if a pack stops holding a charge?
The Bottom Line
For most people, the worx 20v battery winner is the WORX 4.0Ah WA3674.J because it is the official PowerShare pack that runs across the 20V, 40V and 80V tool range with no compatibility questions. If you want more capacity for the money and do not need Nitro support, the Powilling 6.5Ah is the strongest practical runtime choice. And if you are buying batteries and a charger in one go, the Powilling 2-Pack 6.5Ah and Charger kit saves you a second trip.
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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