How long will a 12 volt battery last pulling 2 amps?

To determine how long a 12-volt battery will last while pulling 2 amps, you need to know the battery's amp-hour (Ah) capacity. For example, if you have a 12-volt battery with a capacity of 50 Ah, you can calculate the runtime by dividing the capacity by the current draw: 50 Ah ÷ 2 A = 25 hours. However, the actual runtime may be less due to factors like battery age, temperature, and discharge rate.