Cordless tools are sold as platforms: one battery fits many tools from the same brand. 18V and 20V max batteries are the same class; 20V max is the peak voltage and 18V the nominal. 12V platforms are smaller and lighter for trim, plumbing and electrical work. Higher amp-hour packs run longer, and high-output packs deliver more power to demanding tools. Choose a platform by the tools your trade needs, not just the drill.
The battery platform is the biggest decision in cordless tools. Once you own several batteries, you will keep buying tools from that system.
Voltage classes
| Class | Typical use |
|---|---|
| 12V | Compact drills and drivers, trim, plumbing, electrical |
| 18V / 20V max | Most jobsite tools: drills, impacts, saws, grinders |
| 36V to 60V and dual-battery tools | Heavy cutting, large saws, outdoor equipment |
18V and 20V max describe the same batteries measured differently.
Amp-hours and output
- Compact packs (about 2Ah): light, for overhead and drill-driver work.
- Standard packs (about 4 to 6Ah): all-day use in most tools.
- High-output packs: deliver more current to saws and grinders.
Brushless motors
Brushless motors use electronics instead of carbon brushes. They run cooler, last longer and often include tool electronics that adjust power.
Choosing a platform
- List the tools your trade needs: drills, impacts, saws, grinders, nailers, specialty tools.
- Check each platform has them, at the quality you need.
- Compare battery prices and warranties.
- Consider jobsite crews: matching platforms let batteries be shared.
Safety
Use the maker’s chargers, keep batteries out of extreme heat, and recycle damaged packs at approved drop-offs. Store tools in modular storage.
For the first tools to buy, see drills and drivers. For layout, see rotary vs line lasers. For safety gear, see hard hats.
Browse power tools.
Common questions
Is 20V max more powerful than 18V?
No. They are the same class of battery. 20V max is the peak voltage with no load; 18V is the nominal voltage.
What do amp-hours mean?
Capacity. A 5.0Ah pack runs roughly twice as long as a 2.5Ah pack in the same tool, though it is heavier.
Are brushless tools worth it?
Usually yes. Brushless motors run more efficiently, last longer and get more work from each charge.
Can I use one brand's battery in another brand's tool?
Not without third-party adapters, which can void warranties and bypass safety features. Choose one main platform.