APCRBC123 Replacement Battery for APC Back-UPS XS 1300VA (BX1300G-CA) - Compatible UPS Backup Power Supply Battery Pack - Perfect for Home Office, Computer, and Electronics Protection During Power Outages

this battery pack works in my APC ups battery backup. It slides in place and perfectly fits. I tried buying batteries locally to replace the dead ones in the unit and they did not work very well. This pack is an exact replacement and just works. I have bought 2 of these now (for different units) and both worked the first time they were installed. They hold charge well and seem to charge faster than the original ones.