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.
You already own the Worx tool. All you need is a spare pack that actually holds its charge through a full afternoon of trimming and blowing — and the biggest mistake buyers make here is assuming every “18V” pack on the shelf is a straight swap. It is not. Worx makes three separate 18V battery generations with different slots, so the deciding question is not which pack is strongest; it is which pack physically latches into your charger and your tool. The picks below sort that out first, then rank on real runtime and price-per-pack value.
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.
Quick rule of thumb before you scroll: check your old pack’s model number, not the tool’s marketing name. If the label reads WA3127 or WA3152 you are in one family, and if it reads WA3512 or WA3511 you are in another — getting that identity right is the whole game when shopping for a worx 18 volt battery.
Top Picks
How To Choose The Best Worx 18 Volt Battery
Buying a battery is really two decisions stacked on top of each other: will it lock into my gear, and will it last long enough to be worth carrying. Get the fit wrong and the pack never leaves the shelf. Get the runtime wrong and you are back on the charger ten minutes into the job.
Read your old pack’s model number first
Worx splits its 18V packs into two mounting families. One family covers WA3127 and WA3152 packs, which fit tools like the WG150, WG152, WG250, WG541 and WG900 series. The other covers WA3512, WA3511 and WA3512.1 packs, which fit tools such as the WG151, WG155, WG251, WG540 and WG890. A pack built for one family will not seat in the other. Pull the old battery, read the sticker, and match that number to the listing — that single step prevents almost every return in this category.
Amp-hours decide how long you work, not how strong the tool is
Amp-hours (Ah) measure capacity — think of it as the size of the fuel tank. A 4800mAh pack holds more charge than a 3000mAh pack, so it runs longer between trips to the outlet. It does not make your drill spin faster. If your jobs are short bursts around the house, a smaller pack keeps the tool lighter in your hand. If you are edging a long driveway or blowing leaves across a full yard, capacity is what saves you the walk back to the charger.
Voltage has to match exactly
Your tool is built for 18 volts, and that is the number the pack must deliver. Some listings mention 20V Max compatibility, which refers to a different Worx pack family — these packs will not work in a 20V tool, and a 20V-only pack will not work in these listings. Do not treat a higher voltage number as a free power boost.
Side-by-Side Comparison
| Model | Best For | Capacity | Cell Type | Pack Count | Amazon |
|---|---|---|---|---|---|
| 4800mAh Replacement for WA3127 WA3152★ Best Overall | Biggest single-pack capacity | 4800 milliamps | NiMH | 2 A batteries included | Amazon |
| 2Pack WA3127 4.8Ah (DASNITE)Best Matched Pair | Matched pair for WA3127 tools | 4.8 amp_hours | NiMH | 2 Count | Amazon |
| Shentec 2-Pack 3.0Ah | Lightest pair to carry | 3000 milliamp_hours | Lithium Ion | 2 Count | Amazon |
| 2-Pack 18V 3000mAh Li-ion (Joiry) | Two-pack value with charger safety | 3000 milliamp_hours | Lithium Ion | 2 Count | Amazon |
| 3.5Ah for WA3511 WA3512 (Hanaix) | Lowest-cost single spare | 3.5 A | Other Than Listed | 1 Count | Amazon |
Detailed Reviews
1. 4800mAh 18V Battery Replacement for Worx WA3127 WA3152
Our pick — 4.0+★ from 400+ verified ratings; the strongest balance of quality and price.
The biggest tank in the lineup, built for the pack that keeps dying mid-job.
If your complaint is that a trimmer run dies before the edging is done, this is the pack that answers it. It carries a 4800 milliamp capacity at 18 volts, which the listing totals as 86.4Wh of energy — a genuinely large reserve for a replacement pack. In real terms, that is the difference between finishing a long border in one pass and walking back for a swap halfway through.
Owners consistently describe it as a solid, good-value pack that simply works. The recurring theme in the feedback is solid build and good value rather than drama, and the support angle is refreshing in a commodity category: the seller asks you to message through Amazon directly for compatibility questions, so you can confirm your tool’s model number before you commit. That is the kind of pre-purchase check that saves you return shipping.
The catch is worth knowing up front. Some buyers report shutdowns after roughly ten minutes of run time, which points to either a capacity mismatch with a demanding tool or an occasional weak unit — so this one is best matched to the WA3127 and WA3152 family and to moderate jobs. It is also the heaviest option here at 3.4 pounds, and it uses Ni-MH cells, which lose charge sitting unused faster than lithium-ion does. Charge it the night before a job rather than weeks ahead. Listing compatibility covers WA3127, WA3152, WG150, WG150S, WG152, WG250, WG541, WG900, WG901 and WG901.1, and it will not fit Worx 20V tools.
What it earns its place on
- 4800mAh capacity at 18V gives you the largest reserve on this list for long outdoor sessions.
- Two batteries ship included, so one charges while the other works.
- Direct seller messaging lets you verify your tool’s model number before ordering.
Where it asks something of you
- At 3.4 pounds it is the heaviest single pack here, and you will feel it on an overhead job.
- Ni-MH cells, so it self-discharges on the shelf — top it up the night before.
- Owners occasionally report short run times on heavier tools.
Reach for this if: you own WA3127 or WA3152 family tools and want the longest single-charge reserve with a spare in the box.
Look elsewhere if: your gear uses the WA3512 family — this pack will not seat in that slot.
2. 2Pack WA3127 4.8Ah Battery
Two full-size packs, so the trimmer never waits on a charger.
Two 4.8Ah packs in one box change how you work, not how the tool performs. One pack drains, you click in the second and keep going, and the first goes on the charger at your leisure. For anyone running a string trimmer or leaf blower across a full property, that rhythm is the actual point of buying a two-pack.
The runtime story is the bright spot. Owners describe it charging for a sensible stretch and then running longer than the pack that came with the tool, which is exactly what a higher-capacity replacement should do. It seats in the WA3127, WA3152, WG150, WG152, WG153, WG250, WG541, WG900 and WG901 family, and the listing is explicit that it does not fit the 20V series — worth repeating, because that is the mismatch buyers hit most.
Weigh the weight before you commit. Each pack is 680 grams, and compared to the Shentec pair at 250 grams each, that is a very different feel in your hand — the lighter pair is far easier on long overhead work. The Ni-MH cells also mean you should plan charges rather than expect a pack to sit in a drawer for months and come out full. The seller backs it with a 12-month replacement window and round-the-clock online contact.
What the two-pack really buys you: uninterrupted work. A second pack on standby is worth more on a Saturday morning than a marginally bigger single battery.
The honest trade: that reserve comes at 680 g per pack and a self-discharge habit you need to plan around, so pair it with a charging routine.
Treat this as your default: if your tools and charger read WA3127 or WA3152, this pair covers a full day of yard work without a plug.
Think twice if: you mostly work overhead or one-handed — the lighter Shentec pair will tire your arm far less.
3. Shentec 2-Pack 3.0Ah Battery
Two lithium packs you barely notice in the tool, at a fraction of the bulk.
If your arm is the thing giving out before the battery does, start here. Each pack weighs 250 grams — against the 680-gram DASNITE pair, that is a completely different balance in a trimmer, and it shows most on hedges and anything you hold above shoulder height. You get two of them in the box, so the working rhythm matches the heavier two-packs without the wrist strain.
Runtime is where this one quietly surprises. The consensus among owners is that the packs hold up through real jobs, that they seat properly in the original Worx charger, and that the whole point — reviving older gear — actually lands: as owners mention, “one customer mentions it makes their old Worx equipment work like new.” Fit and value round out the repeat themes. Cell-wise it is lithium-ion at 3000mAh, which means far less shelf drain than Ni-MH packs, so a spare kept in the garage is still usable weeks later.
This is the WA3512 family pack — WA3512, WA3511, WA3512.1 — and the listing also states compatibility with the 20V WA3520 and WA3525 battery models. Confirm that line against your own label, because it is the one spec here that buyers most often misread. The lithium cells are also why you should not leave these on a charger indefinitely; top them up, pull them off, and store them cool.
The weight argument, in numbers: 250 g per pack versus 680 g on the DASNITE pair is the single biggest handling difference in this whole roundup, and it is what makes long overhead sessions bearable.
Pick these up: when your tools run WA3512 or WA3511 packs and your priority is keeping the tool light and the spare topped up.
Skip the swap if: your old pack reads WA3127 — the slot family is different and these will not latch.
4. 2-Pack Replacement Worx Battery, 18V 3000mAh Li-ion (Joiry)
A pair of lithium packs that put circuit protection first and still keep the tool moving.
The detail that separates this pair from the budget single pack is what happens inside the cell. The listing calls out built-in protection against overcurrent, overheating, overcharging and short circuit, plus no memory effect — meaning you can top these up from half-full without shortening their working life, which is the habit most people already have with a cordless tool.
It is a 3000 milliamp-hour lithium-ion pack at 18 volts, two to a box, rated for compatibility with WA3511, WA3512, WA3512.1, WA3523 and tools including the WG151 and WG155. Customers note it drops straight into the original Worx 18V charger and performs as a straightforward replacement, which is all most people want from a spare. The warranty line is the longest in this roundup at 2 years, and the seller promises a reply within 24 hours.
Charging speed is the honest variable. Some owners find it charges briskly, others say a pack will not hold a charge for long — a split that usually traces back to a tired charger or a mismatched tool rather than the cell itself. Each pack is 10 ounces, so it sits between the featherweight Shentec pair and the heavy DASNITE set on your wrist.
Reasons this earns a slot
- Overcurrent, overheating, overcharge and short-circuit protection built into each pack.
- No memory effect, so topping up mid-job is fine.
- Two-year warranty backed by a 24-hour reply promise.
What to weigh honestly
- Charging feedback splits — some packs hold a charge well, some do not.
- 10 ounces per pack is mid-weight, not the lightest here.
- WA3512 family only; it will not fit WA3127 tools.
The case for it: you want a protected lithium pair with the longest stated warranty coverage and you charge from half-full without thinking.
The limit to know: if a pack refuses to hold charge, check your charger model first — that is the likeliest culprit.
5. 3.5Ah 18V Battery
One spare pack to keep a single tired tool alive, without buying a pair.
Not everyone needs two packs. If you have one trimmer and one weak battery, this is the entry point — a single 3.5 amp-hour pack at 18 volts, weighing 327 grams, that covers the WA3512, WA3512.1, WA3511 and WA3513 slots plus the 20V Max WA3520 and WA3525 battery models. The tool list is unusually long for a budget pack, spanning RW9161, WG151, WG155, WG251, WG540, WG890, WU287, WU289, WX163, WX368 and more.
The build is where this pack earns trust: CE, FCC, PSE and RoHS certification plus protection against voltage spikes, short circuit, overheating and humidity. It carries CE, FCC, PSE and RoHS certification and ships with built-in protection against voltage spikes, short circuit, overheating and both high temperature and high humidity — the safeguards you want in a pack sitting in a hot garage. The listing also states it reaches or exceeds OEM product criteria, and the seller offers 30 days for a full refund or return.
Two honest caveats. Some owners find it lasts roughly a year before fading, and a few report it does not seat properly in certain tools — so the 30-day window is genuinely worth using to test the fit the day it arrives. That said, the power story lands: as reviewers point out, it “runs like it has a more powerful motor installed.”
The value read: buying a single replacement pack makes sense when only one tool needs rescuing, and this one covers more tool models than most single packs do.
Test it day one: seat it in your tool and charger immediately, while the return window is wide open.
Buy it when: one tool, one dead battery, and you want a certified single spare without doubling up.
Spend more when: you run multiple Worx tools — a two-pack spreads the cost across both and saves you a second order.
Know the Specs
Amp-Hours and Milliamps
Amp-hours (Ah) describe capacity — how much charge the pack holds, like the size of a fuel tank. Listings in this category mix units: 4.8Ah is the same number as 4800mAh, and a 3000mAh pack is the same figure written in smaller units. The higher the number, the longer the pack runs between charges, but the pack also tends to get heavier. Match capacity to your job length, not to a bigger number on the box.
Ni-MH Versus Lithium-Ion
Both chemistries work in these packs, but they behave differently in storage. Ni-MH cells lose charge sitting unused, so a pack left in a cold garage for a month may need topping up before a job. Lithium-ion packs hold their charge far longer, which makes them the easier choice for an occasional-use spare. Neither is wrong — just plan your charging around which one you own.
Voltage and Compatibility Families
Every pack here is built for 18 volts, and that number has to match your tool exactly. Beyond voltage, Worx splits packs into mounting families: the WA3127 and WA3152 group, and the WA3512 and WA3511 group. A pack from one family will not latch into a tool from the other. Read the sticker on your old pack — that model number is the single most reliable compatibility check you have.
Weight in the Hand
Capacity costs weight. A 250-gram pack is easy to hold overhead for minutes at a time, while a 680-gram pack noticeably shifts the balance of a trimmer. If your work is mostly at waist height, weight matters less; if you are edging, hedging, or holding the tool above your shoulders, the lighter pack keeps you working longer regardless of its capacity.
Common Questions
Will a WA3127 replacement pack fit my WA3512 tool?
Is a 4800mAh pack twice as powerful as a 3000mAh one?
Can I use these 18V packs in a Worx 20V tool?
How long should a replacement pack last before it fades?
Do these packs charge on my original Worx charger?
What is the difference between Ni-MH and Li-ion in these packs?
Should I buy a single pack or a two-pack?
Will these packs work in cold weather?
Do the two-packs ship with both batteries included?
The Bottom Line
For WA3127 and WA3152 tools, the 4800mAh Replacement for WA3127 WA3152 is the pick: 4800mAh and 86.4Wh give it the longest single-charge reserve here, and two packs ship in the box. If your tool is a WA3127 and you would rather have a matched pair that simply outlasts the OEM cell, the DASNITE 2Pack WA3127 4.8Ah is the natural next step up in weight and capacity. And for the WA3512 family — especially if your arm tires before the tool does — the Shentec 2-Pack 3.0Ah wins on handling, since each pack runs 250 grams against 680 grams on the DASNITE pair. Whichever family your tools belong to, buy the pack count that matches your job length — a spare on the charger still stops the job.
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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