HTC One E8 - Manual (Page 49)

Checking battery usage
See a ranking list of apps that are using the battery. You can also see how much and
how long the battery has been used for each app.
1. Go to Settings, and then tap Power.
2. Tap Usage, and then tap an app to check how it's using the battery. You'll see
how much battery power is used by resources such as the CPU for the app and
other use details.
If you see buttons while viewing an app's battery use details, you can tap them to
adjust settings that affect battery usage, stop the app, and more.
Checking battery history
Check how long you've been using HTC One (E8) since the last charge. You can also
see a chart that shows how long the screen has been on, and how long you've been
using connections like the mobile network or Wi-Fi.
1. Go to Settings, and then tap Power.
2. Tap History.
3. If you've used HTC One (E8) for a long time since the last charge, swipe left or
right to scale the graph that details battery usage over time.
You can also slide two fingers together or apart to scale the graph.
Using power saver mode
Power saver mode helps to increase battery life. It reduces the usage of phone
features that drain the battery such as the display and data connection.
1. Go to Settings, and then tap Power.
2. Tap the Power saver On/Off switch to turn power saver mode on or off.
If you want to choose which phone features to conserve power for, tap Power
saver.
If power saver mode's Data connection option is selected, HTC One (E8)
automatically disconnects from the mobile network after 15 minutes when the
screen is off and the data connection is idle (no download activity, streaming, or
data usage). It reconnects and then disconnects periodically when the data
connection is idle to save battery power.
Keep in mind though that the Sleep mode option for the data connection in
Settings > Power, when enabled, overrides power saver mode.
49 Your first week with your new phone