I bought some cheap 360 battery packs on the internet and big surprise they don't work. The problem is that the built in charging circuit charges the packs to around 2.26v when my controller wont turn on until closer to 2.5v. My idea is to use the indicating LED (that came as part of the pack) that has a forward voltage of around 2v to drop the 5v charging voltage down to 3v and charge the packs to that voltage. Theoretically when the packs reach 3v the LED will not be able to sustain the forward voltage and will turn off stopping current flow to the batteries and thus stop charging. I have a lot of knowledge about electronics, however my knowledge of batteries and their sensitivities is just about nill so I thought I'd ask here before I rig this together and get an idea of the likelihood of the batteries blowing up. I've attached an image of the proposed circuit any knowledge would be greatly appreciated.