9.6v 3800mah Tenergy Large Battery (NiMH) Constructed of Nickel Metal Hydride, this battery is a great purchase for the intermediate to advanced airsoft player. The chemistry of its construction makes it low maintenance and cheap on the pocket. The capacity of this battery is 3800 mah, this translates into about 3800 shots before it needs to be recharged. This battery is 9.6 volts which means that it has too much power for a non-upgraded stock gun like a Tokyo Marui, but perfect for guns like Classic Army that are reinforced and pre-upgraded. This battery can typically go through 300 charging cycles before losing efficiency and eventually becoming useless for airsoft skirmishing. Also it only requires discharging for the first 8 cycles of use, after that it can be topped off as needed. Remember to recycle this battery instead of throwing it in the trash! Note: Because of the higher voltage of this battery, it is not recommended for use with non-upgraded stock guns like Tokyo Marui. If your rifle shoots about 350 fps or higher, it should be fine.