[Sapphire1]

I would 1. Check to see if the battery is bad 2. check the charger& cord 3. did you follow the charging instructions that came with the battery? You have to charge it at least overnight then drain it completely before charging it again and do not follow the charge indicator as it is for a regular battery only so you need to leave it on the charger for at least another 3 hrs to achieve a full charge and this process needs to be done the same way for the first 7 days then you can charge as normal but keep in mind that the charge indicator on you phone is for a regular battery only
I have the same battery in two phones and they work great after following these instructions I hope this helps