The cordless drill is the most commonly owned power tool in the world, and it’s often the first tool people buy when entering a battery platform. Choosing the right battery for your drill affects everything from comfort during overhead work to whether you can get through a full project on a single charge.
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Which batteries fit which tools — cross-brand, adapters & Ah, decoded.
This guide covers the best battery pairings for cordless drills across Makita, DeWalt, and Milwaukee — whether you’re hanging shelves or drilling through steel.
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Why Battery Choice Matters for Drills
Drills sit in the middle of the power draw spectrum. They’re not as light as impact drivers, but they’re not as demanding as circular saws. What makes battery choice interesting for drills is weight balance — a drill with a massive battery feels front-heavy and tiring during extended use, especially overhead. For most drilling tasks, a mid-range battery is the perfect compromise.
Match your battery to the task — lightweight 2.0Ah packs for overhead and quick jobs, mid-range 4.0-5.0Ah for general use, and high-capacity 6.0Ah+ only for sustained heavy-duty applications.
Best Batteries by Brand
Makita 18V LXT Drills
- Light use (shelves, flat-pack, small holes): BL1820B (2.0Ah) — compact and light for comfortable one-handed drilling.
- General use (mixed drilling and driving): BL1830B (3.0Ah) — the kit-standard battery that covers most tasks.
- Heavy use (masonry with hammer mode, large hole saws): BL1850B (5.0Ah) — the extra capacity means fewer swaps on high-torque drilling. See our BL1850B replacement guide.
Browse Makita 18V Batteries on Amazon
DeWalt 20V MAX Drills
- Light use: DCB203 (2.0Ah) — lightweight and well-balanced for the DCD series drills.
- General use: DCB204 (4.0Ah) — a sensible size for mixed drilling. See our DCB204 replacement guide.
- Heavy use: DCB205 (5.0Ah) — a common choice for longer drilling sessions. See our DCB205 replacement guide.
Browse DeWalt 18V Batteries on Amazon
Milwaukee M18 Drills
- Light use: 48-11-1820 (2.0Ah) — Milwaukee’s M18 REDLITHIUM CP2.0 compact pack.
- General use: 48-11-1850 (5.0Ah) — the default trade battery that pairs well with M18 FUEL drills. See our 48-11-1850 replacement guide.
- Heavy use: 48-11-1860 (6.0Ah) — for hole saws, auger bits, and all-day use. See our 48-11-1860 replacement guide.
Browse Milwaukee M18 Batteries on Amazon
Combi Drill vs Drill Driver — Does It Change the Recommendation?
Slightly. Combi drills (hammer drills) draw more power in hammer mode when drilling into masonry. If you regularly drill into brick or concrete, go one step higher in capacity than you would for a standard drill driver. For a drill driver used only in wood and metal, the lighter battery option will serve you well.
Our Top Pick
A 3.0Ah battery is the sweet spot for most cordless drill users. It suits mixed drilling while keeping the tool comfortable to use; note that some brands’ 3.0Ah packs weigh about the same as their 5.0Ah packs (Makita UK lists the BL1830B at 0.64 kg and the BL1850B at 0.63 kg). Step up to 5.0Ah if you run a combi drill in hammer mode regularly or use large-diameter bits.
Related Guides
- Best Battery for Impact Drivers (2026)
- Best Battery for Cordless Circular Saws (2026)
- Every Makita 18V LXT Battery Compared
- Every DeWalt 20V MAX Battery Compared
Watch: Video Guide
Frequently Asked Questions
Matching Battery Capacity to Drilling Tasks
Cordless drills are versatile tools used for everything from assembling flat-pack furniture to drilling through masonry. The ideal battery depends on your typical drilling and driving tasks.
Light assembly and home tasks: A 1.5-2.0Ah compact battery keeps your drill light and manoeuvrable. For hanging shelves, assembling furniture, or installing light fixtures, compact batteries provide more than enough runtime and make the drill comfortable to use one-handed.
General construction and renovation: A 3.0-5.0Ah battery suits most trade and serious DIY work. Drilling through studs, driving coach bolts, and boring holes for plumbing or electrical runs all benefit from the sustained current delivery that larger batteries provide.
Heavy drilling (masonry, metal, large holes): A 5.0Ah or higher battery is recommended for hammer drilling into concrete, boring large-diameter holes, or sustained metal drilling. These applications draw significantly more current than standard wood drilling, so a larger pack means fewer swaps.
Weight vs Runtime: Finding the Balance
Drill weight directly affects user fatigue and precision. Compact packs do save weight: Makita UK lists the 2.0Ah BL1820B at 0.38 kg and the 6.0Ah BL1860B at 0.66 kg, a difference of about 0.28 kg. Over a long working day, that can make a difference.
Professional tradespeople often keep both compact and full-size batteries on hand: compact batteries for light driving and overhead work, and larger batteries for sustained drilling. This approach optimises both comfort and productivity.
If you can only buy one battery size, 4.0-5.0Ah is the sweet spot for most drill users. It provides adequate runtime for all but the most demanding all-day drilling while maintaining a reasonable overall tool weight.
What battery should I use for drilling into concrete?
For hammer drilling into concrete, use a 4.0Ah or larger battery from your platform; hammer drilling empties a small pack quickly. Milwaukee says its HIGH OUTPUT packs provide 50% more power than its XC packs, and DeWalt claims “50% more power” for its POWERSTACK compact battery, but we have not tested either in a hammer drill.
Is a compact battery OK for a cordless drill?
Yes — for most drilling tasks, a compact 1.5-2.0Ah battery is fine and keeps the drill lightweight and manoeuvrable. Compact batteries are ideal for overhead work, working in cabinets, and general-purpose drilling. Only step up to a larger battery for sustained drilling, large hole saws, or mixing applications.
Do I need a special battery for a brushless drill?
No. Brushless drills accept batteries from their own platform. Brushless motors are generally more efficient than brushed ones, so they often get more work from the same battery, but we have no specific runtime figures.
Drill Battery Maintenance
For long-term storage, Milwaukee, for example, advises storing packs 40–60% charged at 5–20 °C in a cool, dry place. Makers differ on chargers: Makita’s DC18RC manual says to remove the battery after charging, while DeWalt’s DCB118 manual says a charged pack may be left in the charger. Follow your battery maker’s instructions.
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 →
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.
