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 good news: the strongest option here is also the cheapest, and its 2A charger refills a pack in 25 minutes. The catch most buyers hit is simple — the brand on the box is almost never WORX.
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 can swap out a dead pack without guessing which worx 20v battery and charger combo fits your tools. Each pack below is judged on amp-hour capacity (how much run time it holds), charger output in amps (how fast it refills), and whether the connector actually clicks into your tool.
Top Picks
How To Choose The Best Worx 20V Battery and Charger
You already own the tool. What you need is a pack that slides onto the shoe, locks, and runs long enough to finish the hedge before the light goes. Three numbers decide whether a kit does that, and none of them is the voltage — every pack here is 20V by definition.
Start with amp-hours, not volts
Amp-hours (Ah) measure how much energy the pack holds, which translates directly into runtime. A 3.5Ah pack carries more charge than a 2.0Ah pack, so a trimmer that quits early on a small pack will keep going longer on a bigger one. Bigger does mean heavier, though, so a 3.5Ah pack for a mower is a different buy from a 2.0Ah pack you hold overhead all afternoon.
Then read the charger’s output in amps
Charger output in amps sets the pace. A 2A charger refills a drained pack steadily; the faster chargers in these kits cut that wait. If you only own one pack, charging speed is the whole ballgame — a 2A charger means standing around while a 5A unit gets you back to work. If you own two, you can rotate and let the charger work while you cut.
Match the model number on your old pack
Worx packs carry numbers like WA3525, WA3520, and WA3575, and these replacements list exactly which of those they stand in for. Check your old pack’s label against the listing before you buy. The 20V PowerShare system also lets you pair two 20V packs to run 40V tools on some models, so a pack you buy today can serve a bigger tool later.
Side-by-Side Comparison
| Model | Best For | Capacity | Charger Output | Pack Count | Amazon |
|---|---|---|---|---|---|
| Replacement WA3742 Starter Kit★ Best Overall | Single-pack buyers who want the fastest refill | 3000mAh | 2A | 1 battery | Amazon |
| ADVTRONICS 2 Battery Kit | Running two tools without stopping | 3.0Ah each | 5A | 2 batteries | Amazon |
| Powilling 2 Pack 3.5Ah | Long runtime plus dual-bay charging | 3.5Ah each | Dual-port WA3875 | 2 batteries | Amazon |
| WORX WA3613 Combo Kit | Genuine-brand confidence | 2.0Ah | 2A | 1 battery | Amazon |
Detailed Reviews
1. Replacement 20V Battery and Charger WA3742 Starter Kit
Our pick — 4.5+★ from 200+ verified ratings; the strongest balance of quality and price.
A full pack in 25 minutes, from the cheapest kit on this list.
If you own exactly one tool and hate waiting on a charge, start here. This kit pairs a 3000mAh 20V lithium-ion pack (3000mAh means it holds a decent charge for a full job) with a 2A charger (2 amps is the refill speed), and the maker lists a 25-minute charge time — short enough that you can drain the pack on the front hedge and still finish the back before dinner. The pack slots into Worx 20V and 40V (2x20V) cordless tools, and the listing spells out the fit by model: WG151, WG155, WG251, WG255, WG540, WG890, WG184, WG261, WG324, WG584 and several more.
Build-wise you get a black lithium-ion cell pack with an integrated microchip the maker says guards against overheating, overloading and overcharging. The charger is small and light with an LED indicator so you can see the charging status at a glance instead of guessing. It’s a replacement for the WA3732, WA3742, WA3875 and WA3847 chargers, and stands in for the WA3578, WA3525, WA3520 and WA3575 packs.
What people talk about most is simply that it functions — the pack and charger do their job, and the value line lands well too. It’s rated 4.6 on Amazon, the strongest score on this list, though the longer-running Powilling kit has the deeper review base.
Where it wins
- 25-minute charge time means very little standing around
- 3000mAh pack carries more charge than the 2.0Ah genuine kit
- Certified to CE, FCC and RoHS standards
- Cheapest route to a working pack and charger combo
Where it asks patience
- One battery only — no rotating while the other charges
- Third-party brand, so warranty support runs through the seller
Reach for this if: you want one reliable pack and the fastest refill on the list at the lowest outlay.
Think twice if: you run two tools in a session — the single-pack kits mean a hard stop when the charge runs out.
2. Worx 20V PowerShare Battery & Charger Kit
Two packs and a 5A charger, so one tool never sits idle.
Two 3.0Ah packs plus a single charger is the practical shape for anyone with more than one Worx tool on the shelf. While one pack runs the trimmer, the other sits on the charger, and you swap instead of waiting. The kit’s amperage is listed at 5 A against the 2 A of the starter kit at the top — a far brisker charger, which is the main reason to pay more here.
Both packs are 3000mAh, so you’re getting the same capacity as the starter kit’s pack, just doubled up behind a faster charger. The maker lists over-discharge, overload and short-circuit protection, and notes the cells have no memory effect — meaning you can top up a half-drained pack without wearing it down. It replaces the WA3578 pack and the WA3732, WA3742 and WA3847 chargers, and fits the WA3525, WA3520 and WA3575 slots along with a long list of 20V Worx tools.
Battery quality is the theme that runs through owner feedback, and performance gets positive word too. Runtime is where people split — some find the packs outlast a 2Ah original, and others wish they ran longer on the heavy jobs. Reasonable read: fine for trimmers and blowers, less generous on a mower that asks a lot of a 3.0Ah pack.
The honest trade-off: a 3.0Ah pack is mid-weight, and if your tool is a mower rather than a trimmer, the Powilling 3.5Ah packs down this page hold more charge per pack.
Go this way if: two tools, one session, and you want the charger to keep pace.
Look elsewhere if: one pack is all you ever need — you’d be paying for a second battery you won’t use.
3. Powilling 2 Pack 3.5Ah 20V Battery
The biggest packs here, and a charger that fills two at once.
Where the ADVTRONICS kit gives you two 3.0Ah packs, this one gives two at 3.5 amp-hours — more charge in each pack, which is exactly what a long mowing session wants. Each pack weighs 1.4 pounds, light enough to swing a trimmer with but substantial enough that you’ll notice it if you hold the tool overhead. The listing covers a wide spread of tools, including the WG630, WG620, WG625, WG322, WG320, WG543, WG547, WG170, WG284 and beyond.
The charger is the other half of the story: a dual-port WA3875 that can charge two 20V batteries at the same time. The maker lists a fast charge of a 2Ah pack in about an hour and a 4Ah pack in about two hours. An LED indicator on each pack shows charge level, so you can see how much is left before you commit to a job. CE, FCC and RoHS certification covers the pack itself.
Quality is what kicks off the praise among owners, with charging speed and the dual-bay setup close behind — the draw of two packs running at once makes the whole “swap and keep going” routine feel natural. Battery life is the mixed note: some owners find them long-lasting, others feel they don’t hold up to expectations. At 3.5Ah these are the largest packs on the list, so the mixed feelings likely trace to how hard the tool pulls, not the packs themselves. On the comparison numbers: 3.5 amp-hours against 2 amp-hours puts 75% more capacity in each pack than the genuine WORX kit below.
The charger speed payoff: two bays means the second pack is filling while the first works, and the maker’s own 2Ah-in-1-hour figure makes that rotation practical rather than theoretical.
A fit caveat: the 1.4-pound pack is heavier than a 2.0Ah, so a long session on a handheld tool is a workout — a lower-capacity pack makes more sense for light, overhead jobs.
Best-matched to: the owner with a mower or a full afternoon of cutting who needs two packs that hold real charge.
Skip the dual bay if: you only ever run one pack — the second bay and second pack go unused, and a single-pack kit does the same job for less.
4. WORX 20V 2.0Ah Battery & 2A Charger WA3613
The official kit — smaller pack, but backed by a 3-year warranty.
This is the brand-name pick: a genuine WORX 2.0Ah pack (model WA3669) with the 2A quick charger (WA3881), and a 3-year warranty attached. Its 2 amp-hours is the smallest capacity on the list — 2 amp-hours against the Powilling’s 3.5 amp-hours means noticeably less runtime per charge. In exchange you get the genuine article, an on-board charge indicator on both the battery and the charger, and a long power cord that saves you running an extension cord to the charger.
The pack uses thermoplastic material the maker says keeps it cooler, with 360-degree cell protection around the cells for durability. Because it’s part of the PowerShare system, you can combine 20V packs to drive 20V, 40V, or 80V Worx tools, so a pack you buy now is useful to a bigger tool later. The kit lists a full charge from the 2A charger in one hour.
Here’s the honest read: at 2.0Ah, this is a spare pack, not a primary one. It’s ideal as a spare that rides in the shed for light jobs, or as the original replacement if your tool came with a small pack. If you run a mower all season, you’ll feel the smaller tank inside a few minutes. Where this pick shines is confidence — the 3-year WORX warranty gives you a path back if a cell falters, which third-party kits can’t always match.
The warranty angle: only the genuine kit carries a 3-year warranty, which matters when a cell dies mid-season and you need a replacement without paying again.
The capacity trade-off: at 2.0Ah it’s the smallest pack here — genuinely a spare or a light-duty replacement, not the pack you’d choose for a full mow.
Best for: the Worx owner who wants the original brand and a 3-year warranty over raw runtime.
Not the pick if: capacity is your priority — the third-party 3.5Ah packs on this list hold more charge per pack.
Know the Specs
Amp-Hours (Ah)
Amp-hours tell you how much energy a 20V pack holds, which sets runtime. Higher Ah means longer before the tool slows. A 2.0Ah pack is the lightest spare; a 3.5Ah pack carries the most charge here. Bigger capacity also adds weight, so match the pack to whether your tool sits in your hand or rides low.
Charger Output (A)
Charger amps set the refill pace. A 2A charger is the standard slow refill, while a 5A charger or a dual-port unit cuts the wait and lets you rotate packs. If you own just one pack, choose the highest-amp charger you can — a 5A unit refills far faster than the 2A standard.
Pack Model Numbers
Worx packs carry codes such as WA3525, WA3520, WA3575 and WA3578, and each replacement lists which originals it stands in for. Read the label on your old pack and compare it to the listing before buying — a matching number is what confirms the connector and fit.
PowerShare Compatibility
Worx’s 20V PowerShare system lets the same pack run 20V tools and, on certain models, paired packs drive 40V tools. A pack that fits your current trimmer may well serve a 40V tool later — check that your specific tool model appears in the listing.
Common Questions
Will a replacement 20V pack fit my Worx trimmer?
How long does a 2.0Ah pack last compared to a 3.5Ah pack?
Is a third-party pack safe for my Worx tool?
What charger output do I need to charge a pack quickly?
Can I charge a Worx 20V battery with a different brand charger?
Does charging a half-empty pack wear it out?
How much does a 3.5Ah pack weigh?
Can I use a 20V pack to run a 40V Worx tool?
Which kit is best if I need two batteries?
Is a genuine WORX pack worth choosing over a replacement?
The Bottom Line
For most people replacing a tired pack, the winner is the Replacement WA3742 Starter Kit — a 3000mAh pack with a charger that’s rated to refill it in 25 minutes, at the lowest outlay of the four. If you run two tools through one session and want the charger to keep up, grab the ADVTRONICS 2 Battery Kit with its 5A charger. And for the longest runtime per pack plus a charger that fills two at once, the Powilling 2 Pack 3.5Ah is the one to reach for. If genuine-brand confidence and a 3-year warranty outweigh capacity, the WORX WA3613 covers that.
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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