Ampere hour

**Ampere hour**

An ampere hour (Ah) is a unit of electric charge commonly used to describe the capacity of a battery. It represents the amount of electric charge a battery can deliver at a steady current of one ampere over the period of one hour. For example, a battery rated at 10 Ah can supply 10 amps for one hour, or 1 amp for 10 hours. This measurement helps users estimate how long a battery will last under a specific load, making it essential for determining battery life in devices such as smartphones, electric vehicles, and renewable energy systems. Understanding ampere hours is key to selecting the right battery for your power needs.