iPhone SE 1st Generation Battery Drain

I have my iPhone SE 1st Battery running iOS 15.8.2

My iPhone storage currently is 3/7 full with 32GB of storage

When I take photos, I realized that my battery drain fast!

Normal iPhone SE takes about 10 photos only drain 1% of battery, but mine drains 6% for one photo!

Chess and Geometry Dash I played didn't take much battery, but heavy game like Roblox. 2 minutes and battery ends. Don't know why but normal iPhone SE can play about 10-16 minutes of Roblox experience. Don't know why but please help my phone. It my only phone!