Ok. Gotta say some issues that I faced on our A51. As other members of your A51 telegram group says it also.
First, Battery issues, yes. It drains quick, we're not experiencing this before we updated our phones (or downgraded because they flashed a different firmware) got pnly 5 hours of SOT which I don't experience When I'm still on Android 11.
Second,heating issues, idk but that's normal. But suggest to format your device. But the issue will be gone after some time so that doesn't matter.
Suggest to you guys, you should clear cache everytime you update your device to prevent bugs.
