I phone SE shows 100% charged - shuts off - then shows only 10% charged
I have a I phone SE that I love. It has plenty of storage space - and I like the smaller size.
In other words, no need to upgrade.
However, the phone doesn't seem to be charging properly.
When I go to bed, I plug the phone in. When i wake up, it shows 100% charged. I begin to read the news, and bang - it goes out. When it restarts (which is seems to do on its own), it reads 10% (or some minimal amount) of charge - generally the same as the night before BEFORE i began charging.
do i need a new battery? Other?
Thanks in advance.
iPhone SE, iOS 15