What is amp hour rating in 12 volt battery?

The amp hour (Ah) rating of a 12-volt battery indicates the amount of current the battery can deliver over a specific period, typically one hour. For example, a battery rated at 100 Ah can theoretically provide 100 amps of current for one hour, or 50 amps for two hours. This rating helps determine how long a battery can power a device before needing to be recharged, making it crucial for applications like renewable energy systems, electric vehicles, and backup power supplies. Higher amp hour ratings generally mean longer usage times but may also result in a larger and heavier battery.