[m4a1sniper]

I just got my gun upgraded (by a professional) and got a large batteries. The batteries are not lasting as long as they should. My friend with the same upgrades and same battery can shoot for about 4 times as long as me. If i shot on full auto for more than 10 sec my 15amp fuse would blow. My motor seems to be having a hard time turning my gun over and i was wondering if getting a new 8.4v motor will help out my battery life consiterably and mabe give some suggestions as to what would be the best choice.

My battery is a 8.4v 3300MaH Nimh and my motor is the stock EG 1000 motor

Thanks, Jordan