[ELI5] Why are battery capacities expressed in Ah (Amperes-hour) and what does it mean, for example, a AA battery that is 2500 mAh?
In: 68
It’s a stupid term for expessing joules, just like kilowatthour but worse.
2500 mAh means that the battery can deliver 2.5amps current for an hour, or 1 mA for 2500 hours.
now thats great but you still need the voltage thats under that current, but typically your battery will say what voltage there is.
The power output (joules/second) is P=U*I, or power = current * voltage
So with a 12 voltage battery with a batterylife of 2500 mAh it can store: E = current * voltage * time = 2.5A * 12V * 3600 seconds or 108k joules which is about 3% of a kwh
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