Thank you very much, this is very helpful information. For some reason I've always thought that "constantly charging a battery" would have a negative effect on the battery itself. I notice that if my phone is constantly plugged in, the battery becomes very hot at times, like it's overcharging or something. Is there a special charging circuit in the eDGe which routes DC power directly to the motherboard bypassing the battery if the battery is full? I just hate the idea of power flowing in from the battery constantly, while the DC re-charges what was just used. Like how FIFO(First-in First-out) works.
Or am I just completely uneducated in new battery circuits? When DC is connected, does it even touch a fully charged battery, or just supply power to the main board?