PAIRING MECHANISM FOR UPS

A power system includes a lever bar configured to move between a first position and a second position. In the first position, the lever bar is configured to enable the power system to mate with a first type of replacement battery cartridge, mate with a first type of external battery connector, block a second type of replacement battery cartridge, and block a second type of external battery connector. In the second position, the lever bar is configured to enable the power system to mate with the second type of replacement battery cartridge, mate with the second type of external battery connector, block the first type of replacement battery cartridge, and block the first type of external battery connector.