Cordless Tool Battery Compatibility: A Canadian Buyer's Guide
Key takeaways
- Batteries are interchangeable within a brand's voltage platform, not across brands.
- DeWalt 20V MAX fits all DeWalt 20V MAX tools; FlexVolt batteries also run them.
- Milwaukee M18 and M12 are separate platforms and do not interchange.
- Cross-brand adapters exist but can void warranties and affect performance — use with caution.
How cordless battery platforms work
A cordless tool battery is matched to a brand's platform — a voltage class with a specific battery foot. Within one platform, any battery fits any tool: a DeWalt 20V MAX battery runs every DeWalt 20V MAX drill, saw or driver. Across brands, the feet and electronics differ, so a Makita battery will not seat in a Milwaukee tool.
The major platforms at a glance
- DeWalt 20V MAX — fits all 20V MAX tools; FlexVolt (60V/20V) batteries are backward-compatible and run 20V MAX tools too.
- Milwaukee M18 & M12 — two separate platforms. M18 batteries fit M18 tools only; M12 fits M12 only. They do not mix.
- Makita LXT (18V) & XGT (40V) — separate platforms with different battery feet.
- RYOBI ONE+ (18V) — one of the broadest single platforms; today's batteries fit ONE+ tools going back years.
- Bosch — 12V and 18V Professional lines are separate platforms.
What about battery adapters?
Third-party adapters let one brand's battery power another brand's tool. They can be handy if you are committed to one battery system, but they add bulk, can affect run-time and tool protection, and typically void the manufacturer warranty. For anything high-draw (saws, grinders, impact wrenches), stick to the native platform.
How to buy the right battery
Match three things: the brand, the platform/voltage (e.g. 20V MAX, M18, LXT 18V), and the amp-hours (Ah) you need. Higher Ah means longer run-time and more weight — 2.0Ah for light tools, 4.0–5.0Ah for general use, 6.0Ah+ for saws and high-draw tools. Always confirm the exact platform name on your tool before ordering.
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Frequently asked questions
Are all 20V batteries interchangeable?
No. '20V' refers to a brand's platform, not a universal standard. DeWalt 20V MAX batteries fit DeWalt 20V MAX tools, but not another brand's 20V tools.
Can I use a Milwaukee M18 battery on an M12 tool?
No. M18 and M12 are different platforms with different battery feet and voltages. They are not interchangeable.
Do battery adapters work?
They can power a tool, but they may reduce performance, remove some tool protections and void the warranty. Use the native platform for high-draw tools.
Product information is for general reference only. Specifications, finishes and compatibility can vary — always check the manufacturer’s listing and instructions. For electrical, plumbing, gas or structural work, follow your local building and electrical codes and use a licensed professional where required.