Cordless Angle Grinders Compared: DeWalt, Milwaukee, and Metabo

Cordless angle grinders from DeWalt, Milwaukee, and Metabo (now sold as Metabo HPT in some markets) all serve the same basic purpose: cutting, grinding, and sanding metal or masonry without being tethered to an outlet. Since these tools are typically bought as part of a larger battery platform rather than in isolation, the decision usually comes down to a few practical factors beyond the grinder itself.

Battery Platform Compatibility

For most buyers, the single biggest factor is which battery ecosystem they are already invested in. If you already own DeWalt 20V batteries, a Milwaukee M18 grinder is not a practical option regardless of how it performs, since batteries and chargers are not cross-compatible between brands. If you are starting fresh, it is worth considering the full range of tools available on a platform, not just the grinder, since buying into an ecosystem is really a long-term decision about future tool purchases.

Disc Size and Intended Use

Angle grinders are commonly sold in small (around 4.5 to 5 inch disc) and larger (7 to 9 inch disc) sizes. Smaller grinders are lighter, easier to control one-handed, and suit most home and light fabrication tasks like cutting rebar, sharpening blades, or removing rust. Larger grinders handle heavier material removal and bigger cutting jobs but are noticeably heavier and generally require two-handed operation. Matching the tool size to the type of work you actually do matters more than choosing the largest available option.

Motor Type and Runtime

Brushless motors have become the standard on higher-end cordless grinders across all major brands, and they generally offer better efficiency, more runtime per charge, and a longer motor lifespan than older brushed designs, since there are no brushes to wear down. When comparing runtime claims between brands, remember that actual battery life depends heavily on the amp-hour rating of the specific battery pack used, not just the tool itself, so comparing tools bundled with different battery sizes is not an apples-to-apples comparison.

Safety Features Worth Checking

Angle grinders are among the more dangerous power tools in a typical shop, so safety features deserve real attention. Look for kickback brake technology that stops the disc quickly if it binds, an electronic clutch that disengages the motor during a sudden jam, and a spindle lock that makes changing discs safer and easier. A tool-free guard adjustment is a smaller convenience feature but makes it far more likely you will actually reposition the guard correctly for different tasks rather than skipping it. Paddle switches with a lock-off function also reduce the risk of accidental startup during storage or transport.

In the end, choosing between these grinders is less about which brand makes a fundamentally better motor and more about matching disc size, safety features, and battery ecosystem to how and where you actually plan to use the tool.

Cordless Angle Grinder Comparison at a Glance