Ni-MH 9.6V 1600mAh STICK 2-module battery
New technologies have been applied to Ni-MH batteries, resulting in high performance and high voltages. Ni-MH batteries belong to a group of batteries that have a powerful energy density and therefore have a higher capacity for the same volume than batteries made with older technologies. A pack made from Ni-MH cells is ideal for use in airsoft guns. An unquestionable advantage of NiMH cells is that they do not have the memory effect like NiCd batteries, which significantly extends their service life. An additional positive feature is the weight to capacity ratio.
How to use NiMH batteries ( PDF )