Buying guide · 7 min read
How to pick your first cordless battery platform
Before you buy a single tool, pick the battery platform you'll live with for the next 5-10 years. Here's how to choose between M12, M18, 20V MAX, and FlexVolt.
Step 1: Buy the battery, not the tool
This feels backwards but it's the right way to think about it. A $150 drill is a $400 decision over five years once you factor in the packs. Pick the platform first, then pick tools.
The four platforms that matter
- ▸Milwaukee M12 — compact, light, perfect for under-sink work, electrical, HVAC service. 30+ tools.
- ▸Milwaukee M18 / M18 FUEL — the pro contractor workhorse. 250+ tools, biggest specialty lineup (cameras, cable pullers, press tools).
- ▸DeWalt 20V MAX / XR — framing, general construction. ~200 tools. Widely shared on jobsites.
- ▸DeWalt FlexVolt 60V — same chassis as 20V MAX tools, plus 60V options (miter saws, table saws, big recips). One pack, two voltages.
Which platform wins for your work
- ▸Residential remodel, finish carpentry → M18 FUEL
- ▸Framing, new construction → DeWalt 20V MAX XR + FlexVolt
- ▸Electrician, plumber, HVAC service → M18 FUEL + M12 FUEL for tight spaces
- ▸Weekend DIY → whichever your neighbor/buddy has (shared batteries)
- ▸Solar / off-grid installer → M18 FUEL (M18 RedLithium has best cold-weather tolerance in our testing)
Pack sizes and which one to buy first
Start with the mid-size pack: M18 XC 5.0Ah or DeWalt 20V MAX XR 5.0Ah. It handles 90% of daily work without being a brick. Add a compact 2.0Ah later for lighter tools and overhead work. Only jump to the HD 8.0Ah / 9.0Ah / 12.0Ah packs when you're hitting runtime limits on current packs — they're heavy and most tools can't use the extra capacity efficiently.
FAQ
Can I use third-party batteries in Milwaukee or DeWalt tools?+
Yes, physically. No, practically. Aftermarket packs void warranty, often have inferior battery management, and have been involved in fires. We only sell genuine OEM packs.
How long do Milwaukee M18 batteries actually last?+
Genuine M18 Red Lithium packs typically get 1,000-1,500 full charge cycles before capacity drops below 80%. At a typical contractor pace (one full charge every 2-3 days), that's 5-7 years of real use.
Is it worth buying a starter kit or a bare tool?+
Starter kits make sense for your first tool on a platform (you need batteries and charger anyway). Every subsequent tool on the same platform, buy bare — you already own the packs. That's exactly why we stock so many bare tools.