[unvivid]

I've heard that it's more an issue with the heat than anything. Hot Batteries are not charged very efficiently and under more extreme circumstances it can cause the charge process to stop completely until the phone cools down. I've ran WMWIFIRouter for 24+ hours on full performance without an issue. That was with the phone propped up and a small fan blowing on it. I've seen a fully charged newish phone die in less than 4 hours while charging with WMWIFIRouter running when it was laying on a blanket. Heat seems to play a very important role here.