[on_and_off]

Even high end devices often have batteries issues. Battery tech is just not that great.

Usually they arrive at the one year date though.

Otherwise, you should be able to track the culprit with the battery historian (unless it is hiding behind play services ..)

[scholia]

They'd be a lot better if they just made the phone 1mm thicker ;-)

[on_and_off]

that would help a lot for sure. Batteries would still lose roughly half of their maximum capacity over time though, afaik battery tech has not solved that yet.