A battery is rated as follows: 2600 mah 12 V 5C My question is what does each of these values mean? 2600 mah is the "capacity" of the battery. To my understanding this means you can draw 2600 ma current from this battery for exactly one hour; after one hour the battery is dead. Or you can draw 1300 ma for two hours...etc. Whatever your design desires. 12 V is the voltage of the battery. My understanding is if you want to connect this battery to a motor or something similar, the voltage needs to be the same or the battery/motor would be damaged? But I've also read that as the battery is drained its voltage changes, so how does this not damage the device its connected to? 5C is the "capacity" multiplied by 5. This means this battery can produce 5*2600 = 13000 mah. This means the battery has a max capacity of 13000 ma for one hour. Then doesn't this make the first 2600 mah value meaningless and redundant? This is the one that is confusing me greatly. Also suppose I know this battery has energy density of 173 wh/kg. Also assume the battery weighs 10 kg. Then it has 1730 wh. 1730 watts for one hour. How is this related to 2600 mah value? They must have some relation because both are basically describing power for one hour. Thank you very much for answering my questions.