Below are some steps that I performed to limit the battery drain
1. Wipe cache partition
2. Go to each app's info -->
i. Mobile Data --> disable - Allow background data usage
ii. Battery --> disable -Allow background activity
3. Disabled chrome, because it hogs on resources & battery
4. Disabled - Auto Sync Data
5. Disable/Uninstall social media apps
6. Used sleeping & Deep sleeping apps.
7. Always on Dark mode.
There are few more steps. Buzz me here on facebook.com/kardesai