If the battery is quickly emptied, this is often due to apps running in the background, but also functions such as WLAN and Bluetooth or the screen itself require a lot of battery power. The Oppo-Smartphone analyses the battery consumption of the last three days and can be viewed as a list in the battery settings. In the detailed view, the approximate runtime and the calculated power consumption in mAh can be found out.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Battery
Step 3:  Tap on  Phone battery usage
  1. Open the Settings
  2. Tap on Battery
  3. Tap on Phone battery usage

Oppo Instructions