🔋 Battery Basics: Watt-Hours vs. Amp-Hours for Tool Performance

When shopping for cordless power equipment, the battery is the engine. You’re constantly bombarded with two main specifications: Amp-Hours (Ah) and Watt-Hours (Wh). Which number really matters, and how do they relate to the runtime and power of your tools?

The short answer: Watt-Hours (Wh) is the single most important number for measuring the total energy stored in a battery, but you need to understand both to make smart purchasing decisions.