Can anyone point me to an article about how Samsung does its battery indication? I have searched Google but found nothing helpful. The specific question is that I have bought a high capacity aftermarket battery, and the results are fantastic, but the battery comes with an instruction to run it right down several times. Last night (after two days of solid use!) it got down to 23%, so I put the screen to maximum, switched on the torch, and ran several intensive apps (like satnav). I got it down to 1% after a considerable time (maybe 3 hours) but it then stuck at 1% for another 2 hours. Presumably it was calibrating itself. I eventually gave up, put it on charge and went to bed. So have I now knackered the chances of ever having an accurate battery indication, or is the situation recoverable? Also what happens if I now put the ordinary battery (which I keep in my pocket as an emergency backup) back in? As I say, no need for a full answer if you can point me to an article. Thank you!