Worx angle grinder battery

Updated: October 2026

A Worx angle grinder battery is the part the cheap listing leaves out. The WX803.9 is about £81.41 and the WX801.9 is about £60.03 on amazon.co.uk prices from 16 October 2026, and neither includes a pack or a charger. You need a 20 V PowerShare battery before either tool will spin. A 2.0 Ah pack will fit and still run flat quickly on the 125 mm grinder. This page is that decision: bare tool, 2.0 Ah against 4.0 Ah, and a second pack. No disc was timed. A purchase through our links can earn a commission at no extra cost to you. The tools are on the Worx angle grinder comparison.

Our top picks

Badge	Product	Battery in box	Pack	Charger	Note	Price	Offer
Best overall	Worx Worx WX801.9 76 mm mini bare	No	Same 20 V platform	Not included	9.2	about £60.03	View offer
	Worx Worx WX812 125 mm kit	Yes	4.0 Ah included	Included	9.2	about £144.49	View offer
Best value	Worx Worx WX803.9 125 mm bare	No	You add 4.0 Ah class	Not included	9.0	about £81.41	View offer

Best overall

Worx Worx WX801.9 76 mm mini bare

9.2/10about £60.03

View offer

Rank 2

Worx Worx WX812 125 mm kit

9.2/10about £144.49

View offer

Best value

Worx Worx WX803.9 125 mm bare

9.0/10about £81.41

View offer

On this page

1.What a bare Worx grinder leaves out
2.2.0 Ah or 4.0 Ah
3.Charging time and a second pack
4.Bare tool plus pack against the kit

What a bare Worx grinder leaves out

Tool only means the motor, the guard or protector, and a disc or a key. It does not mean a battery. The WX803.9 listing says you need a Worx 20 V PowerShare battery and a compatible charger. The WX801.9 listing says the same. The WX812 kit is the contrast, at about £144.49 with one 4.0 Ah pack and a charger in the box. The MakerX WX990 also includes a pack, and it is a 50 mm hobby grinder, not a 125 mm body. PowerShare packs move between 20 V Worx tools. Check the charger connector before a new Pro pack.

2.0 Ah or 4.0 Ah

Worx quotes these packs around an 18 V nominal rating even when the title says 20 V max. On that figure a 2.0 Ah pack stores about 36 Wh and a 4.0 Ah pack about 72 Wh, about twice the energy. Minutes still depend on the disc and how hard you push. No runtime is claimed for these ASINs. UK reviewers of the WX803.9 say a smaller pack drains quickly. One says 5.0 Ah is the minimum. That is one comment, not a test. A 2.0 Ah pack can still suit the 76 mm WX801.9 for a few screws. Worx UK listed a 2.0 Ah pack at £31.99 on 16 October 2026. The 4.0 Ah Pro pack, WA3644, is on the Worx UK site, and no price for it is stated here. Match that class if you buy the body alone.

Testsieger

Worx Worx WX801.9 76 mm mini bare

9.2/10about £60.03

View offer

Charging time and a second pack

Worx’s WA3880 charger sheet, a 2 A charger, lists about 58 minutes for a 2.0 Ah pack and about 125 minutes for a 4.0 Ah pack. Those times are for that charger. A second pack lets you keep cutting while the other charges. For one bracket in an evening, one 4.0 Ah pack is enough. Reviewers who say the battery dies quickly are describing the small-pack case. The WX812 kit gives you one 4.0 Ah pack and no spare, so the same charger wait arrives once that pack is flat. A bare-tool buyer who already owns two packs is ahead of a kit buyer with one.

Bare tool plus pack against the kit

The WX803.9 is about £81.41 and the WX812 kit is about £144.49. The gap is £63.08, which has to cover a 4.0 Ah pack and a charger if you own neither. A 2.0 Ah pack at £31.99 uses about half of that and still leaves a charger. No 4.0 Ah price is invented here. If pack and charger cost more than £63.08, the kit is the simpler buy. If you already own both, the body is cheaper by the whole gap. Do not step from 125 mm down to the WX801.9 because the body is cheaper. Disc class is the buying guide. The skip rule is the best Worx angle grinder page. Worx UK states 2+1 years on a PowerShare battery, and 3+2 on a Pro battery, if you register within 30 days. The corded route is the cordless and corded page.

Common questions

What battery do I need for a Worx angle grinder?

You need a Worx 20 V PowerShare pack and a charger that accepts it. For the 125 mm WX803.9, plan on a 4.0 Ah pack rather than 2.0 Ah. The WX812 kit already includes a 4.0 Ah pack and a charger. The WX801.9 uses the same platform and is still sold without a pack. Check the connector if your charger is an older one.

Is a 2.0 Ah battery enough for the WX803.9?

UK reviewers say a smaller pack drains quickly under load on that bare 125 mm tool. One reviewer suggests 5.0 Ah as a minimum. A 2.0 Ah pack will run the tool for light, short cuts and then stop. It is a weak choice if you bought the body to do steel work. The listing itself gives no runtime in minutes, and that comment is not a timed test.

How much longer does a 4.0 Ah battery last than a 2.0 Ah?

About twice the stored energy, as a rule of thumb. At the 18 V nominal figure Worx uses, 2.0 Ah is about 36 Wh and 4.0 Ah is about 72 Wh. That is not a promise of twice the minutes on a particular disc. Pressure, material and a blunt wheel all change the result. No timed runtime is claimed for these ASINs.

Do I need a second battery?

You need one if a single 4.0 Ah pack will not finish the pieces you have clamped, because a 2 A charger needs about 125 minutes for a 4.0 Ah pack on the WA3880 sheet. A second pack lets you keep cutting. For one short job in an evening, one 4.0 Ah pack is enough and the wait happens after you have finished.

Is a bare tool plus battery cheaper than the WX812 kit?

Only if the pack and charger you still need cost less than the £63.08 gap between about £81.41 and about £144.49, or if you already own them. A £31.99 2.0 Ah pack does not answer that, because you still need a charger and reviewers do not recommend that pack size for the 125 mm body. A 4.0 Ah pack is not priced on this page.

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