S6500 battery out of power fast

[sharkOmouth]

My Galaxy Mini 2 S6500 powers off even when the it is charging. It acts like the battery is out of power after only using it for no more than half hour. Lost my only spare battery, bought from Mpj 3 months ago, somewhere between school and house last month. Can this problem be fixed with a brand new battery? or it's time for new phone? Any advice would be really appreciated!

 

[Rukbat]

The charger isn't an external power supply for the phone, it's a battery charger. Charging with the phone on just discharges the battery slower. Turn the phone off if you want it to charge.