Hello.
- Reduce brightness to 50% or lower
- Some apps run in the background when you are not using them: Go to Settings > Battery or Battery usage to check which apps consumes more energy and uninstall these apps
- Some apps consume more energy than others (Games, whatsapp) Make sure to reduce brightness and volume when using such apps.
- Features such as Wi-Fi and Tethering & portable hotpot consumes more energy: Make sure to put your tablet to sleep mode when Tethering from it or reduce brightness when using Wi-Fi
- Perform a soft reset: Press and hold the power button for 15-20 seconds or until the tablet reboots.
- Please reply below for further assistance.