Phone charging funny, now won't charge

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http://forums.androidcentral.com – So mistake number 1, I got a used razr. I know. The person told me it was brand new and they only used it for a week but decided to go with a different carrier so they were selling the razr. Right when I got it I charged it, activated it and it worked just fine. That night I plugged it in when I went to bed about 10 it was at 5% battery...woke up at 330 AM and it was again at 5% battery but said it was still charging. I moved it to a different outlet and when I woke up at 5:30 it was at 40% battery. Unplugged it when I left for work, it dropped to 30% battery and I plugged it in at w (HowTos)