Cordless random orbit sanders run continuously while you work, making battery capacity the single biggest factor in how much sanding you can do between charges. Unlike tools that pulse or fire intermittently, a sander’s motor spins non-stop from the moment you pull the trigger until you release it.
We compare the best batteries for cordless sanders across Makita 18V LXT, DeWalt 20V MAX, and Milwaukee M18 to help you pick the right pack for your sanding workload.
Quick Recommendations
| Use Case | Makita 18V LXT | DeWalt 20V MAX | Milwaukee M18 |
|---|---|---|---|
| Best all-round | BL1850B (5.0Ah) | DCB205 (5.0Ah) | 48-11-1850 (5.0Ah) |
| Best for heavy use | BL1860B (6.0Ah) | DCB206 (6.0Ah) | 48-11-1860 (6.0Ah) |
| Smaller pack | BL1830 (3.0Ah) | DCB204 (4.0Ah) | 48-11-1840 (4.0Ah) |
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.
Get the free Power-Tool Battery Compatibility Handbook (PDF)
Which batteries fit which tools — cross-brand, adapters & Ah, decoded.
Why Battery Choice Matters for Sanders
Sanders run continuously while you work, so a job such as sanding several doors can use a lot of battery. The makers do not publish runtimes for these tool and battery pairs, and we have not tested them, so we do not estimate them. We suggest 5.0Ah as a minimum for serious prep work.
Weight matters less with sanders than with overhead tools, because the sander sits on the workpiece. Check real pack weights if you sand vertically: Makita UK lists its 3.0Ah and 5.0Ah LXT packs at about the same weight (0.64 kg and 0.63 kg).
Best Batteries for Makita Sanders
Makita’s 18V LXT powers the DBO180Z 125mm random orbit sander.
Makita BL1850B — Best All-Round (5.0Ah)
The BL1850B is our pick for most sanding prep jobs on the 125 mm DBO180. Makita UK lists it at 0.63 kg, about the same as the 3.0Ah BL1830B, so the extra capacity costs little in weight. Makita does not publish a runtime for this pair, and we have not tested one.
Makita BL1860B — Best for Heavy Use (6.0Ah)
The BL1860B has 20% more capacity than the BL1850B, and Makita UK lists it only 30 g heavier (0.66 kg vs 0.63 kg), so it suits sanding multiple doors, large surfaces or production finishing. Makita does not publish a runtime for this pair.
Makita BL1830 — Smaller Pack (3.0Ah)
The BL1830 is a 3.0Ah pack for touch-up work between coats or sanding a single small item. It does not save weight, though: Makita UK lists the BL1830B at 0.64 kg, about the same as the 5.0Ah BL1850B.
Best Batteries for DeWalt Sanders
DeWalt’s 20V MAX range includes the DCW210B brushless variable-speed random orbit sander.
DeWalt DCB205 — Best All-Round (5.0Ah)
The DCB205 is DeWalt’s 5.0Ah 20V MAX pack (US part number; DeWalt’s UK 5.0Ah 18V XR pack is the DCB184) and our pick for the DCW210B and similar sanders. DeWalt does not publish a runtime for this pair, and we have not tested one.
DeWalt DCB206 — Best for Heavy Use (6.0Ah)
The DCB206 has 20% more capacity than the DCB205, for large surface prep, multiple coats or production work. DeWalt US lists it at 2.25 lb against 1.54 lb for the DCB205, so expect a little more weight.
DeWalt DCB204 — Best Lightweight (4.0Ah)
The DCB204 is a 4.0Ah pack, slightly lighter than the 5.0Ah DCB205 (DeWalt US: 1.4 lb vs 1.54 lb), for between-coat scuffing and small projects.
Best Batteries for Milwaukee Sanders
Milwaukee’s M18 platform offers the M18 FROS125 125 mm random orbit sander.
Milwaukee 48-11-1850 — Best All-Round (5.0Ah)
The 48-11-1850 is Milwaukee’s US M18 REDLITHIUM XC5.0 pack (Milwaukee’s UK 5.0Ah M18 pack is the M18 B5) and our pick for the M18 FROS125 and similar sanders. Milwaukee does not publish a runtime for this pair, and we have not tested one.
Buy Milwaukee 48-11-1850 on Amazon
Milwaukee 48-11-1860 — Best for Heavy Use (6.0Ah)
The 48-11-1860 is Milwaukee’s US M18 REDLITHIUM XC6.0 pack (an XC pack, not a HIGH OUTPUT one), with 20% more capacity than a 5.0Ah pack, for all-day finishing work.
Buy Milwaukee 48-11-1860 on Amazon
Milwaukee 48-11-1840 — Smaller Pack (4.0Ah)
The 48-11-1840 is Milwaukee’s US M18 REDLITHIUM XC 4.0 pack, for touch-up and between-coat work. It may not save much weight: Milwaukee UK lists its 4.0Ah and 5.0Ah M18 packs (M18 B4, M18 B5) at the same 0.7 kg.
Buy Milwaukee 48-11-1840 on Amazon
Full Comparison Table
| Battery | Platform | Capacity | Best For | Buy Link |
|---|---|---|---|---|
| Makita BL1850B | 18V LXT | 5.0Ah | All-round sanding | Amazon |
| Makita BL1860B | 18V LXT | 6.0Ah | Large surfaces / production | Amazon |
| Makita BL1830 | 18V LXT | 3.0Ah | Touch-ups / between coats | Amazon |
| DeWalt DCB205 | 20V MAX | 5.0Ah | All-round sanding | Amazon |
| DeWalt DCB206 | 20V MAX | 6.0Ah | Large surfaces / production | Amazon |
| DeWalt DCB204 | 20V MAX | 4.0Ah | Light sanding / scuffing | Amazon |
| Milwaukee 48-11-1850 | M18 | 5.0Ah | All-round sanding | Amazon |
| Milwaukee 48-11-1860 | M18 | 6.0Ah | All-day finishing | Amazon |
| Milwaukee 48-11-1840 | M18 | 4.0Ah | Touch-ups / between coats | Amazon |
Watch: Video Guide
Frequently Asked Questions
How long does a sander run on one charge?
The makers do not publish runtimes for these tool and battery pairs, and we have not tested them, so we do not estimate them. A 6.0Ah pack holds 20% more charge than a 5.0Ah pack, and a 3.0Ah pack 40% less.
What’s the best battery for all-day sanding?
A 6.0Ah battery with a spare on the charger. That gives you continuous sanding with minimal downtime. Alternatively, two 5.0Ah batteries rotated between tool and charger works well.
Does sanding drain batteries faster than drilling?
Sanding is continuous rather than stop-start, so total battery use per session is often higher than for drilling. We have no maker figures comparing the two and have not measured them.
Does variable speed affect battery life?
Lower speed settings generally draw less power, but we have no maker figures for how much battery that saves.
Are sander batteries interchangeable between brands?
No. Makita 18V LXT, DeWalt 20V MAX (UK: 18V XR) and Milwaukee M18 are separate battery systems, and each maker’s tools take its own packs. See our Makita, DeWalt, and Milwaukee compatibility pages.
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 →
