The user manual, here; http://www.google.com/url?sa=t&source=web&cd=1&ved=0CBQQFjAA&url=http%3A%2F%2Fwww.cyberpowersystems.com%2Fuser-manuals%2FCP485SL_UM.pdf&rct=j&q=485VA%20manual&ei=xv5rTcyfFIK8lQfK1Z3sCA&usg=AFQjCNEwLJWkSdw8vYNqlu0cht9jAO2jmA&sig2=0-4DgQzCfnq37_2SSTmJ9w&cad=rja will guide you through removing the battery and installing a new one. You can buy a new one here: http://www.batteryuniverse.com/UPS/CyberPower/485VA/VRLA1250_CyberPower_485VA_UPS-Battery
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