I am asking for my friend. Her iPhone heats up when it's charging, is this normal? Another problem, during charging, our battery indicator usually shows a 'thunder' logo on the top right battery indicator but even NOT FULL YET (the battery indicator), the 'thunder' logo changed to an 'adapter' logo, which means it's fully charged. I compared hers against my iPhone, no heating at all, is this normal?

This only happens the past few days for her. We both use Maxis set, mine is 1 mth old and hers is only 2.5 weeks plus. Pls help, thanks!

She uses charger to charge as she worries USB will spoil her battery. I am asking her to try using USB and see if this still occurs. What about battery heating, mine doesn't heat up but hers does she said. It's warm, even the front screen.