With a AA battery rated at 2000mAH, it can power the circuit forĢ000mAH/200mA= 10hours. So, for example, let's say there is a circuit that consumes 200mA per hour. D cells provide current for a longer period of time than all others. Reason, D cells are physically bigger and are more expensive than C or AA batteries. A AA battery may have a mAH of 2000, while a D cell may have 10,000mAH. So batteries with higher mAH's are more desirable, because they can last for a longer period of time, since they have a higher current capacity.ĪA batteries usually have the shortest mAH life, while D cells have much greater mAH. The circuit's power requirements, how much current the circuit demands.īeing that the mAH is the battery's life in terms of current capacity, the more mAH's means the longer a battery can last, or the more current it can supply in a circuit. The mAH specification shows how long a battery will be able to last in a circuit, given Thus, our same example, of a 1900mAH battery can be used in the following ways, The product of the current consumed times the number of hours in use must equal Or for other circuits, it can supply 190mA of current for 10 hours, since 190*10=1900. In this case, the battery supplies 380mA forĥ hours, since 380*5=1900. Usually a circuit will not demand 1900 mAH of current all at once for operation.Ī circuit may instead only need 380mA of current for operation. Again, as an example, a 1900mAH battery can supply 1900mA of current to a circuitįor one hour, and then it will have used all of its charge.

Again, mAH, iillliampere-hours, show how many milliamperes of current the battery can

How much battery life is 5000mah