If I want to leave my phone undisturbed for a few hours but want to conserve as much charge as possible, should I leave it shut down or in Android's power saver mode.
Also say I want to check the time every half an hour, would it be better to leave it in power saver, or shut down, and start the device every time I want to see the time (or make a short call at the most)?
P.S. I'm using Jellybean, but answers for other OSs can also be posted for reference.