Nokia 3310 Power On Off Key Jumper, Track, Ways

Nokia 3310 Power On Off Key Jumper, Track, Ways 

The very first thing that you need to do is to check battery voltage at its terminals in order to verify whether the problem is with the battery or with anything else. (Battery voltage should be at least 3.8V).
If the battery voltage is lower than 3.8V or is not showing charge then it means you need to change your battery in first place and check.

The very first thing that you need to do is to check battery voltage at its terminals in order to verify whether the problem is with the battery or with anything else. (Battery voltage should be at least 3.8V).
If the battery voltage is lower than 3.8V or is not showing charge then it means you need to change your battery in first place and check.

Good luck.