When we do cordless grinder reviews we look for one thing: Power. This is unusual, because with other tools you need to get a larger picture of a tool’s capabilities. With cordless grinders, however, power is the dominating metric. Can it cut through metal efficiently? Is it a tool that can support grinding welds? The new DeWalt 60V FlexVolt angle grinder is near-unstoppable. The Metabo 9-inch cordless angle grinder is a beast that is unmatched anywhere in terms of cordless capabilities.