For best performance and warranty support of your APC UPS, use only genuine APC replacement batteries with your APC UPS Each APC Replacement Battery Cartridges (RBC) is tested and certified for compatibility to restore the performance of your APC UPS to original specifications When you buy a new genuine APC RBC, you can recycle your old UPS battery via the "RBC Recycling Program" on the APC website. This program includes free return to a recycling center (use the packaging from your new battery to return the old) RBC18 is compatible with APC Smart-UPS Models SC250RM1U, SC450RM1U APC WARRANTY: Genuine APC Batteries are backed by a 2 year Manufacture Warranty