So, if you plan to work out in the morning, expect to have very little battery life left at the end of the day. (tomsguide.com)
On recent phones using newer hardware, it uses very little battery and you'll probably never notice it, but it can also have a dramatic impact on battery life on older phones. (androidcentral.com)
You can lower screen brightness on the phone, and the Auto - Lock time to make sure the screen consumes as little battery juice as possible. (bgr.com)