Ok, I bought an ICS mp5 at gearbox two weeks ago.No battery or charger so I got a smart charger and a 8.4v 1600 mAh NiMh which was told will run gun fine. The battery was charged and when fired I didnt even use half of the mid-cap when it stopped working. Took it back to them and they didnt find anything wrong with gun. Recharged battery and it did it again, got the same battery new. Just shot the gun and it did the same exact thing. What is wrong with it??