S3- charging problems. Recognising being plugged in but not holding any charge.

[AC Question]

So I've had my S3 for months now without any problems. Today I plugged my phone into charge and after a couple of hours noticed the charge had actually dropped. But I checked the little battery symbol in the notifcation bar which tells me that the phone is in fact charging. The little lightening symbol is there and everytime I unplug/plug in the charger my screen wakes up.
Does anyone know why my phone isn't holding any charge?

 

[B. Diddy]

Welcome to Android Central! Batteries can always fail, so trying a replacement is the first thing to do.

 

[Steph Atkins]

Hey,I went and brought a new battery today and it's made no difference I still have the same problem

 

[B. Diddy]

Thanks for registering! So the new battery isn't charging up either? Check the battery contacts inside the phone--are they clean?