So for a DIY project i'm doing, I want to replace my iPhone battery (about 1810 mAh, 3.7V) with a NiMH battery (300 mAh, 1.2V) but I need help getting past some of the problems (and maybe more). First of all. I've read that iPhone batteries are non-removable, is this true? I've also read that I will require more circuitry to do this, but I'm not sure what. Will the battery still run on 1.2V? If not, do I have to do something like put 3 of them in series? Are there any other problems I need to work around?