“ The screen is very battery intensive, so reading a book is actually a little more battery intensive than listening to a book
or podcast. Using your phone for GPS is very battery intensive.
Using Cell data or talk is more battery intensive than WiFi.
I keep my Cell Data radio off and use WiFi when I access the Internet unless I need to access
the Internet when WiFi is unavailable, and I keep WiFi off unless I'm using it.
Programs you can't get rid of will log in and use data, so I suggest turning
off cell data as well, unless you don't mind wasting your battery and have an unlimited data
plan. Get rid of the ones you don't need. The GPS radio is needed
for navigation, or perhaps some information occasionally, but unless you have a fitness
device that is monitoring your movement, you don't need
it on most of the time. Only the Cell radio is needed for a
phone to act as a phone. I've set my phone to
turn off at midnight and turn back on at 8 am. Batteries
are not worn out by use, but rather by charging them back up. ”