CPS RBC18 Replacement UPS battery kit, suitable to replace the APC RBC18 replacement battery cartridge.For use with APC Smart UPS Models:For use with APC UPS Models: PS250 PS250i PS450 PS450i PS450i1U All CPS replacement UPS battery kits are assembled using high quality sealed lead/acid batteries manufactured by CSB which are fitted by APC in both new equipment and also replacement battery cartridges.Please note: APC & RBC are registered trade marks of American Power Conversion Corporation and Critical Power Supplies Ltd use them for reference purposes only.