New technologies have been applied to Ni-MH rechargeable batteries, resulting in high capacity and high voltages. Ni-MH batteries belong to a group of batteries that have a powerful energy density, which is why they 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 ratio of weight to capacity.
It's quite a heavy battery (which is logical since it has 3 parts). I charged it to 2100 mAh, no problems there. You'll need a lot of space in your batterystock, but for my Krytac that is no problem.
Really great battery, good quality. They could improve on the included 'instruction'.
A bit heavy, but packs quite some punch. They do not fit all types of weapon (e.g. G36), so be careful. I've tested it with an M4A1 and it fits perfectly.