Battery problem

[PeachesU]

Hey guys I have 71 that I just bought and wasn't thinking and left the dome light on, needless to say it killed the battery and I had to jump it. Well I had a retard moment and crossed the wires and sparks flew. I thought I just shorted the bat because I could jump start it just fine. So I went and bought a new bat and it started up just fine but after letting it sit for a week I went out and tried to start it again and no juice. It'll start after charging for awhile but won't hold the charge. Any help would be greatly appreciated.
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