My Samsung M21 was performing so well answer giving me super battery backup since last 1.5 month,but suddenly it started performing poor,the battery is consuming at increasing rate, i checked all the things are okay.
2. Settings>>Location>improve accuracy >disable A. Wifi scanning B. Bluetooth scanning .
3. Device care>battery >power mode>select "optimised" and "adaptive power saving".
And then click on "app power management > And enable these 2 options. A. Adaptive battery B. Put Unused Apps to Sleep.
FOR ANDROID 11; A. DEVICE CARE > Battery>Background Uses Limit > Put Unused App to Sleep B. Device care>click on 3dot at top right corner>automation>adaptive power saving C. Device Care > Battery> More Battery Settings>Adaptive Battery
4. Long press on each app specially 3rd party app(LIKE FACEBOOK, YOUTUBE) and rarely used apps and also ON "GOOGLE APP" as well, then click on>app info(ibutton)>> go to these 3 options below on by one
A. Mobile data> allow background data usage>off
B. Battery >allow background activity >off
C. Notification >disable unnecessary notifications like promotional and unnecessary reminder notifications.
5. Go to settings> privacy > permission manager > location> and check which app have accessing your location all the time and if you not using that apps much, then deny access or set as " allowed only while in use" As unnecessary location access by 3rd party app causing battery drain.
6. Go to settings > Google > on device sharing> check which 3rd party apps present there for e.g. if you use paytm , paytm will shared data to show recommendation and suggestion which also cause battery drain
7. Go to settings > account and backup> Manage account > check which app syncing automatically there, and if any app which not necessary to auto sync then click on it and "disable sync"
8. Go to settings >apps>search "weather" >click on weather settings (icon)> change "auto refresh" settings as per your requirements and disable some unnecessary reminder. ( due to auto refresh it continuously consuming battery)
9. If you use Facebook frequently then disable "auto play video" And if you are mostly uses mobile, on wifi connection then also disable "auto play videos" in YouTube.
10. Settings>Google >click on 3dot at right top corner>usage and diagnostics >off this option.
Checked all the steps, and saw these were previously in this mode as you said in the comment, after doing all the changes i went for sleep and after waking up i found 10% charge has gone 😆
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