What is Battery Capacity?
The capacity of a battery is its electrical energy content as expressed in ampere hours (AH). It is determined by the amount of electrical energy the battery can deliver, under specified conditions of temperature, rate of discharge and final battery voltage, over a certain period of time. The capacity rating of a battery is usually expressed in milliAmpere-Hours (mAH).
1000mAH = 1AH
Higher the capacity rating of a battery, i.e. higher the mAH, longer the battery will last. For example, a battery rated at 1000mAH capacity will last for 1 hour in a device that draws current of 1000mAH and a battery rated at 2000mAH capacity will last for 2 hours in the same device. For portable devices that are used for longer periods of time without the possibility of recharging, a high capacity battery provides a clear advantage. A high capacity battery would give a longer runtime and reduce downtimes due to unexpected battery failures. This is especially true for devices like two way radios and barcode scanners.