7.2v 500mah Tokyo Marui Micro EX battery (NiCd) This battery has six cells in a custom pack configuration, made of Nickel Cadmium. This means several things in electrical and airsoft terms. The capacity on the battery is 500 mah, which translates into about 500 shots (maybe as much as 600) before the battery loses charge and needs to be put on another cycle. The second affects charging cycles. NiCd batteries have to be discharged before they can be charged during a typical charging cycle. If you don't discharge and instead just try and "top it off", the battery will eventually develop a memory like the older cell phone batteries. But this seeming deficiency is also a big positive in other areas. NiCd batteries are able to hold their charges longer during periods of time when they are not being used. They can also go through more charging cycles before loosing efficiency, on average about 450 versus the 300 that most NiMH batteries get. Note: This battery is intended to work with the Tokyo Marui M7A1, Mac-10, and Scorpion AEPs. It will not work with the 18c, P8, or M93R AEPs.