I picked up a G&G Combat Machine and need help choosing a battery. I have gotten conflicting information... 1) One experienced player recommended a LiPo - 11.1v 1200mAh 15-25c. and... 2) An Airsoft tech from an Army/Navy store was sure that the LiPo would ruin the gun! He suggested a 9.6 NiMh, just as the instructions that came with the gun suggested. What's the deal?