An Ampere-hour (Ah) is a unit of electric charge that represents the amount of current a battery can deliver over time. Specifically, one ampere-hour equals one ampere of current supplied for one hour. It is a standard measure of a battery’s capacity—how much electric charge it can store and deliver. In the battery industry, ampere-hours are used to:
Indicate battery size or capacity
Compare energy storage capability between batteries
Help determine runtime for applications like EVs, tools, or electronics
