Increased battery without charging?

lately Ive noticed a few strange things with the battery life on my iPhone 14 Plus.

First occurrence, I was scrolling Reddit and noticed my phone had 2% battery remaining. I told myself I wouldn’t plug in the charger, once the phone dies that’s how I know I’ve had enough Reddit for the day. But the phone stayed at 2% for another 45 minutes. I brushed it off because I figured I wasn’t pulling much energy on Reddit.

Second occurrence, today, 06/26, I was again scrolling and noticed my phone was again at 2%. I didn’t plug it in. I go get food and I’m gone approximately an hour. I comeback to my phone and the battery life is at 5%. So it went up 3%.

This doesn’t seem like a bug in the hardware. It’s feels like malware, spyware, ransomware, keylogger, Trojans and rootkit. Because that’s not normal behavior for a phone, old or new. It seems something wants me to think my phone is dead went it’s actually not.

What should I do? Factory reset?