This is very important. The #1 thing that nobody knows about the iPhone is that you can actually turn it off while charging. Neither Apple, nor tech blog websites have noticed this, but from the moment that you buy your iPhone, the battery has been running ever since that day. Your iPhone has not been turned off for a year. That is why people are experiencing battery problems. If you turn off your iPhone at night and leave the iPhone plugged in, that battery would last slightly longer when you go to use it.