"I use this battery in a CYMA CM.028a. Yes, it does stick out the stock, but black cloth and tape fixed that. The battery is at least 6 or 7 inches. It is MASSIVE which is why it is a large type. This battery increased the rof extremely. Since it has a large energy input, the trigger response actually changed which is new. It lasts really long. You can probably play three games without it dying on you. Well it depends on what kind of mags you run. I would recommend using a smart charger because I am not sure how long to really charge it."