I've been adding upgrades to my G&G GR15 Raider to improve trigger response and power. After putting the gearbox together (motor, trigger, lower receiver, etc.) and hooking it up to a 9.6v NiMH battery, the wires get really hot after 60-90 consecutive shots on semi. They seem to get hottest at the Tamiya connectors. What's interesting is that the battery's wires get a lot hotter than the new silver wiring I installed. Here are the relevant upgrades: Magic Box 30K High Torque Motor SHS 8mm Oilless Bushings G&G Low Resistance Wire Set (silver) SHS 13:1 Super High Speed Gear Set SHS Steel Teeth High Speed Piston SHS M110 AEG Spring I corrected for AoE, improved the airseal by stretching out the piston head O-ring, and shimmed the gears bevel-to-pinion style. I shimmed them to the point where the gears spin about 2 rotations freely and have maybe 0.1mm of up-and-down play (I'd say about the thickness of a sheet of paper but I suck at gauging thickness). I'm not sure how serious this issue is, or what else I can do to fix it. I'm worried the battery might get ruined after a prolonged firefight, and I plan on taking this new build to an op in a week. Any advice/suggestions are greatly appreciated.