Suppose you have an APC UPS and have just purchased a battery pack to go with it. Connecting the battery pack is pretty straightforward, but did you know you need to tell your UPS that an additional battery pack has been installed? Setting this in your UPS, optimizes the usage of the entire battery capacity.
If you are using PowerChute software, and have connected the UPS to a computer using serial, USB or network interface, you will be able to set this parameter in the software.
Log into the management card using your web browser (default user and password: apc).
Navigate to UPS, and inside Configuration, select General.
Set the correct battery pack number and click on the Apply button ...