Almost all airsoft AEGs use rechargeable batteries. These batteries vary from your standard rechargeable NiCd battery, to your more efficient NiMH rechargeable battery. Airsoft rechargeable batteries come in a variety of voltages, milliamps and sizes. It’s important to make sure to buy the right size and voltage battery for your AEG. We recommend that all airsoft rechargeable batteries be charged with a compatible smart charger (or LiPo balancer), which not only charges the battery in a fraction of the time a standard wall charger takes but also extends the life of your airsoft battery!