I have a G and G M16 which had a 8.4 V Lipo battery, however I broke it. When I was looking to buy a new one a saw the range of batteries and after a bit of research I found out all I needed to know, except is it possible to break a AEG rifle by using a to big/powerful battery? Btw my gun is a very good quality and expensive gun, so it could maybe take a bit more than most guns.