« on: February 22, 2011, 11:48:57 AM »
The original 7.2v battery for my stock CYMA CM030 is slowly dying. So, instead of simply buying a replacement, I rewired the AEP for an external NiMH battery pack that attaches under the barrel (like a laser or flashlight). The battery is a custom 7.2v 1500mah NiMH made of six Elite 2/3A cells. The problem Iâ€™m facing is that the gearbox now seems to over-cycle each shot on semi-automatic. With the original battery, it would first load a BB, fire the piston, and stop with the nozzle partially back. Now it fires first, loads the next BB, and stops with a BB in the chamber and nozzle fully forward. Sometimes this loaded BB rolls out the barrel even with the hop-up set right. And with certain BBs, I get double feeds. I checked the reversal stop latch, tappet plate and cam, semi-auto cut-off plate, hop-up, and magazines. All appear fine and all function normally with the original battery. So, Iâ€™m looking for advice as to why the gearbox over-cycles with this new battery. Should I go with a lower voltage pack? A stronger main spring? Do people with custom installed 7.4v Lipo battery packs face this same cycling/loading issue?