HTC One E8 - Manual (Page 50)

Extreme power saving mode
In times when you don't need to use much of your phone, turn Extreme power saving
mode on to extend battery life longer. In this mode, standby time can last longer than
usual, and you can only use the most basic functions such as phone calls, text
messaging, and email.
1. Go to Settings, and then tap Power.
2. Tap the Extreme power saving mode On/Off switch to turn extreme power
saving mode on or off.
If you want to set when to automatically switch this mode on, tap Extreme
power saving mode and select a battery level.
Tips for extending battery life
How long the battery can last before it needs recharging depends on how you use
HTC One (E8). HTC One (E8) power management helps to increase battery life.
If you like more control by tweaking settings on your own, try out some of these
battery saving tips.
Check your battery usage
Monitoring your battery usage helps you identify what's using the most power so you
can choose what to do about it. For details, see
Checking battery usage on page 49.
Manage your connections
§ Turn off wireless connections such as mobile data, Wi-Fi, or Bluetooth when not
in use.
§ Turn GPS on only when a precise location is needed, such as while using
navigation or location-based apps. See
Turning location services on or off on
page 145.
§ If the Sleep mode option in Settings > Power is enabled, at low peak times, your
phone will turn off the data connection after the screen has been off for 15
minutes and there's no network activity (no downloads, streaming, or data
usage). The data connection resumes when you switch the screen back on.
§ Turn on Airplane mode when you don't need any wireless connections and you
don't want to receive calls or messages.
Manage your display
Lowering the brightness, letting the display sleep when not in use, and keeping it
simple helps save battery power.
50 Your first week with your new phone