Battery usage data isn't available on Android (FIX) - Mobile Internist
Here is how to fix the battery usage not showing up since 1st January 2021 on OneUI 3 devices. After deleting the app data wait a few minutes and you should see
How to Check Battery Health on Android
Solved: battery usage not showing - Samsung Members
On Android phones, why doesn't battery usage add up to 100% under Settings - Battery? It only sums up to 60% or so. - Quora
Simple steps to improve the battery life of your Android phone
battery usage data isn't available
How to fix the Android app if it's not working - Newegg Knowledge Base
Fix Google Play Services Battery Drain on Android - Make Tech Easier
10 Tips to Boost Your Android Phone's Battery Life | PCMag