iPod 80 gb battery

about two years ago i bought a battery from you.

if1950281 for my 80GB ipod photo Video Model A1136 emc 2065 and serial 8L640cz0v9r. After replacing it charged for a very long time in fact it over charged, unit got very hot Worked for a few hours and never charged or worked again. I now would like to order another batt. However I come up with the same part number and I'am afaid the same thing will happen again.The replacement battery you sent me was a littel difrent then the orig. Can you please let me know what is the correct part number so I can order it. thanks Pete