HTC One M8 User Manual page 80

80 Your first week with your new phone
Checking battery history
Check how long you've been using HTC One 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 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.
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.