I have a motorcycle battery rated as 8.4 Ah (20 HR). It also says 8 Ah (10 HR) and I am not sure what the difference is.
Anyway, I have a GPS tracker fitted with a rated consumption of 5 mA. According to this formula I have to divide battery capacity by consumption:
8.4 Ah from battery / 0.005 A consumption = 1680 hours (70 days)
Is this correct? The reason why I am posting this is because the battery says 8.4 Ah, which is only double as many mobile phone batteries:
Why is this motorbike battery so heavy then if it's only double the capacity? Is it because it's a 12 V one? My knowledge in electronics is zero as you can see.