I salvaged a few parts from an old RC heli. I also took the main circuit which controls the motors and has the built-in remote control. I want to power it but I don't have the original battery any more. I did some research and I found that the battery was a 3.7V 350mAh LiPo. How can I power the circuit with AA battery? I tried to buy the same battery (as the original) but couldn't.