Enabling low power mode automatically shows the percentage of battery left on my iPhone. I left my iPhone 5 on stand by (not charged) overnight, and in the morning, it showed 60+% battery. I connected to my Mac to sync, it immediately drops to ~38%. I have observed this multiple times. This can be a problem if one thought their iPhones still have more battery left that they actually did. Anybody else seems to be observing a similar issue?