Angle grinders are among the most demanding tools in any cordless arsenal. They draw sustained, heavy current—especially under load—and quickly drain batteries designed for lighter work.
Pairing your grinder with the right battery isn’t just about runtime; it’s about avoiding burnout, maintaining power delivery, and protecting your investment. A 2.0Ah compact battery runs down quickly; a 6.0Ah high-capacity pack holds three times the charge.
This guide covers the best batteries for Makita 18V LXT, DeWalt 20V MAX, and Milwaukee M18 grinders—with recommendations based on the makers’ published specifications.
Quick Recommendations: Best Batteries for Angle Grinders
| Brand | Grinder Model | Best Battery | Capacity |
| Makita | DGA452 | BL1860B | 6.0Ah |
| DeWalt | DCG412 | DCB206 | 6.0Ah |
| Milwaukee | 2780-20 FUEL | 48-11-1860 | 6.0Ah |
Starter packs by platform
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Before you buy: check that the size, fitting/bore and maximum-rated speed marked on the accessory match what your tool’s manual specifies. We have not physically tested these products; listings are compiled from published specifications. These are affiliate links.
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Runtime varies with load, disc type and material hardness. The makers do not publish grinder runtimes for these batteries, and we have not tested them.
Why Battery Choice Matters for Angle Grinders
Angle grinders are high-draw, sustained-load tools. Unlike a drill that pulses power, a grinder runs continuously at full or near-full current. This creates three critical challenges:
1. Battery Drain Is Rapid
A grinder under heavy load uses a battery’s charge quickly, so plan on more than one battery for long jobs. Compact 2.0Ah and 3.0Ah packs are a poor fit for angle grinder work: you will swap them constantly. The makers do not publish grinder runtimes for these batteries, and we have not tested them.
2. Power Delivery Under Load
When you press a loaded disc into metal, the current draw rises. A larger pack holds more charge, so you can work longer between swaps; maker packs also include protection electronics that cut power if a pack is overloaded or overheats (Makita’s Star Protection, for example).
3. Heat Buildup
Sustained high current generates heat in both the tool and the battery. Rest packs between heavy sessions and let hot packs cool before charging.
Makita 18V LXT: Best Batteries for the DGA452
The Makita DGA452 is a 115mm (4.5″) compact angle grinder—nimble and popular on job sites. It’s less brutal than larger 230mm models, but still demands proper battery support.
Top Pick: Makita BL1860B 6.0Ah
The BL1860B is Makita’s 6.0Ah 18V LXT battery (0.66 kg); runtime on a grinder varies with disc size, material and technique. Makita says its Star Protection guards against overload, over-discharge and overheating.
Expect to spend £40–60 for original Makita; third-party alternatives often cost £25–35. See current prices on Amazon.
Second Choice: Makita BL1850 5.0Ah
The BL1850B (5.0Ah) suits intermittent or light grinding — cutting plastic, trimming light rust, polishing. For sustained metalwork you will swap batteries more often.
Cost: £30–45. Check Amazon for current stock.
Budget Option: Makita BL1840 4.0Ah
Not the best choice for dedicated grinder work. A 4.0Ah pack runs down sooner under grinder load; if you already own one it will work for light duty, but use 5.0Ah or higher for real jobs.
For compatibility, see our complete Makita 18V LXT battery compatibility guide.
DeWalt 20V MAX: Best Batteries for the DCG412
The DeWalt DCG412 is a 125mm (5″) angle grinder—slightly larger than the Makita DGA452 (115mm). It benefits from the DCB206 6.0Ah pack but also pairs well with DeWalt’s FLEXVOLT lineup for sustained high-draw work.
Top Pick: DeWalt DCB206 6.0Ah
The DCB206 (6.0Ah) is DeWalt’s 6.0Ah 20V MAX pack, with a built-in charge gauge; in the UK the comparable 18V XR packs include the DCB184 5.0Ah. The makers do not publish grinder runtimes for these batteries, and we have not tested them.
Cost: £45–70 for genuine DeWalt; third-party OEM equivalents run £28–40. View current pricing on Amazon.
Premium Alternative: DeWalt FLEXVOLT DCB547 54V (9.0Ah)
DeWalt’s FLEXVOLT DCB547 is rated 9.0Ah at 18V and 3.0Ah at 54V. DeWalt says FLEXVOLT batteries work in its 18V XR (US: 20V MAX) tools such as the DCG412, where they operate as 18V packs, and give 54V in 54V tools. It is heavy (1.46 kg). The makers do not publish grinder runtimes for these batteries, and we have not tested them. FLEXVOLT batteries are more expensive (£70–100) but give flexibility across your tools. See our DeWalt 20V MAX and FLEXVOLT compatibility guide for more details.
Minimum Acceptable: DeWalt DCB205 5.0Ah
The DCB205 (5.0Ah) works for short grinding sessions or light intermittent cutting. For production use, a larger pack means fewer swaps.
Cost: £25–40. Check prices on Amazon.
Full compatibility: DeWalt 20V MAX battery compatibility page.
Milwaukee M18 FUEL: Best Batteries for the 2780-20
The Milwaukee 2780-20 FUEL is a 125mm (5″) brushless grinder with serious cutting power. Milwaukee’s M18 FUEL platform is engineered for high-draw tools, and the 48-11-1860 6.0Ah pack is the natural match.
Top Pick: Milwaukee 48-11-1860 6.0Ah
The 48-11-1860 is Milwaukee’s M18 REDLITHIUM XC6.0 pack. Milwaukee also sells HIGH OUTPUT (48-11-1865) and FORGE packs aimed at high-draw tools. The makers do not publish grinder runtimes for these batteries, and we have not tested them.
Cost: £50–75 for genuine Milwaukee; aftermarket options £30–50. See current prices on Amazon.
Second Choice: Milwaukee 48-11-1850 5.0Ah
The 48-11-1850 (XC5.0) suits intermittent grinding or light cutting; for heavy use, a 6.0Ah pack means fewer swaps.
Cost: £35–55. Check Amazon availability.
Compatibility reference: Milwaukee M18 battery compatibility guide.
Full Battery Comparison Table
| Brand | Model | Capacity | Voltage | For Grinders? | Typical Price |
|---|---|---|---|---|---|
| Makita | BL1860B | 6.0Ah | 18V | ✓ Recommended | £40–60 |
| Makita | BL1850B | 5.0Ah | 18V | ✓ Acceptable | £30–45 |
| Makita | BL1840B | 4.0Ah | 18V | Light duty only | £25–35 |
| DeWalt | DCB206 | 6.0Ah | 20V MAX (18V nominal) | ✓ Recommended | £45–70 |
| DeWalt | DCB547 (FLEXVOLT, UK) | 9.0Ah at 18V / 3.0Ah at 54V | 18V/54V | ✓ For FLEXVOLT owners | £70–100 |
| DeWalt | DCB205 | 5.0Ah | 20V MAX (18V nominal) | ✓ Acceptable | £25–40 |
| Milwaukee | 48-11-1860 (XC6.0) | 6.0Ah | M18 | ✓ Recommended | £50–75 |
| Milwaukee | 48-11-1850 (XC5.0) | 5.0Ah | M18 | ✓ Acceptable | £35–55 |
Prices are approximate guide prices, not live retailer prices. The makers do not publish grinder runtimes for these batteries, and we have not tested them.
Key Takeaways
1. Buy 6.0Ah minimum. Angle grinders are power-hungry. 5.0Ah is a bare minimum for intermittent work; 6.0Ah is the standard for sustained grinding.
2. Avoid compact batteries. 2.0Ah, 3.0Ah, and 4.0Ah packs are designed for cordless drills and impact drivers. In a grinder, they’ll deplete in minutes and potentially suffer thermal damage.
3. Carry spares. Even with a 6.0Ah battery, plan to swap packs during long grinding sessions, and keep a second battery on charge.
4. Match the platform. Makita 18V LXT, DeWalt 20V MAX, and Milwaukee M18 are not interchangeable. Ensure your battery platform matches your grinder model.
5. Genuine packs. Batteries from the tool maker (Makita, DeWalt, Milwaukee) are designed and tested for their own tools and include the makers’ protection electronics.
Watch: Video Guide
Frequently Asked Questions
Q: Can I use a 4.0Ah battery for angle grinding?
A: Technically yes, but it is not the best fit. A 4.0Ah battery (like Makita’s BL1840B or DeWalt’s DCB204) holds two-thirds of the charge of a 6.0Ah pack, so you will swap more often on sustained grinding. For regular angle grinder use, start at 5.0Ah; 6.0Ah is the better choice.
Q: What’s the difference between 5.0Ah and 6.0Ah runtime on an angle grinder?
A: A 6.0Ah battery holds 20% more charge than a 5.0Ah pack, so expect roughly 20% more grinding between charges in the same tool. The makers do not publish grinder runtimes for these batteries, and we have not tested them.
Q: Are third-party batteries safe for angle grinders?
A: Packs from established third-party brands can be well made, but they are not covered by the tool maker’s testing. The Power Tool Institute warns that counterfeit batteries are not certified by any recognised lab. For high-draw tools, genuine batteries are the safer choice.
Q: Can I use a DeWalt FLEXVOLT battery on a 20V MAX grinder?
A: Yes. DeWalt says FLEXVOLT batteries work in its 18V XR (US: 20V MAX) tools, where they operate as 18V (US: 20V) packs. A DCB547 is rated 9.0Ah at 18V (3.0Ah at 54V) but weighs 1.46 kg. The makers do not publish grinder runtimes for these batteries, and we have not tested them. FLEXVOLT batteries cost more (£70–100). See our detailed cross-compatibility guide for more.
Q: Why do angle grinder batteries drain faster than drill batteries?
A: Angle grinders run at continuous high current, whereas drills work in bursts, so a grinder uses a battery’s charge faster. That is why grinders suit high-capacity packs (5.0Ah and above).
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Last updated: March 2026
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How we compile this guide
We cross-reference compatibility details against manufacturer specifications where available, official tool manuals, and the physical standards that govern fitment (bore sizes, arbor diameters, voltage platforms, connector types). We prioritise primary sources over retailer listings, flag anything we can’t confirm, and re-verify the data on a regular cycle. Where we give a buying recommendation, we tell you the reasoning — not just the link. More on our method →
