Understanding mAh ratings is essential when purchasing a battery for an airsoft gun. mAh stands for milliamp hours and is the most common unit of measurement for battery capacity. It is important to know the mAh rating of a battery to understand how long a device will run on it before it needs to be recharged. The higher the mAh rating, the more power the battery can store and the longer the airsoft AEG can run or shoot before needing to be recharged. For example, if one battery has an mAh rating of 1000 and another has an mAh rating of 2000, the one with 2000 will last twice as long as the one with 1000. Additionally, batteries with higher mAh ratings tend to be bigger and heavier than batteries with lower mAh ratings. When purchasing a battery, it is important to consider not only the mAh rating but also the size and weight of the battery as well as its intended use. Knowing these details will help you find the best battery for your device.