Ampere-hours (Ah) represent a battery’s capacity to deliver a specific amount of current over a defined period. A battery rated at 10 Ah, theoretically, can supply 1 amp of current for 10 hours, or 2 amps for 5 hours, assuming a constant discharge rate and environmental conditions. This metric quantifies the total electrical charge a battery can store and discharge. The practical capacity may vary from the stated rating due to factors such as temperature, discharge rate, and battery age.
Understanding battery capacity is crucial for various applications, from selecting the appropriate battery for a device to estimating runtime and planning for replacements. This knowledge helps avoid premature discharge, optimize battery lifespan, and ensure reliable power supply. Historically, the measurement of capacity has evolved with advancements in battery technology, from rudimentary measurements to precise electronic testing.