Battery output diminishes over time @Shahidayub
The battery is non removable so would need to be carried out by an authorised engineer.
A Samsung Phone usually receives 2 major updates in it's lifetime so I agree with @Steven9761 that unless the phone still ticks your wants and needs boxes consider an upgrade.
🌈 Stay Safe & Stay Alert. 🌈
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help.