And I don't agree that the reboot is actually using 40% battery to complete (or that a custom rom with its fewer processes will alleviate this). As I said, the voltage is being reported wrongly. However, you won't see the situation improve without buying a new battery. I suggest you buy a genuine Samsung replacement off eBay or similar, IMO there's no point stuffing around with fakes which aren't their claimed capacity.
Sent from a galaxy far, far away