HTC desire 530 User Manual page 133

If the Battery option on the App info screen is grayed out, it means the app is
currently not using the battery.
Checking battery history
Check how long you've been using HTC Desire 530 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. From the Home screen, tap
2. Tap Power.
3. Tap History to view battery usage over time.
Battery optimization for apps
When you have connections such as Wi-Fi on while the phone is in sleep mode, some
apps may still continue to use the battery. Starting from Android 6.0, battery
optimization is enabled for all apps by default which helps prolong battery standby
time when you're not using the phone.
The phone needs to be sitting idle for an extended period of time before battery
optimization takes effect.
Turning battery optimization off in apps
If there are apps that you don't want battery optimization enabled, you can turn the
feature off in those apps.
1. From the Home screen, tap
Power and storage management
, and then find and tap Settings.
, and then find and tap Settings.
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