UPSBatteryCenter APC Back-UPS XS 1000 BX1000 Compatible Replacement Battery Cartridge UPSBatteryCenter APC Back-UPS XS 1000VA Compatible Replacement Battery Pack For use with UPS model #: BX1000 (Make sure this is the exact model #) In-Stock and Ready for Immediate Shipment - 1 Year Warranty included! Hot Swappable, No Downtime Required - Arrived assembled and ready for use Manufactured & sold exclusively by UPSBatteryCenter