Apc - Schneider Prem RBC18, Lead acid, Spill-proof, Black, Easy Hot-Swap Installation, Maintenance-Free Lead Acid Battery, Full assembly that is plug and play, 2 sealed lead acid batteries with cables, and connectors. The brand new replacement battery set for your APC RBC18 includes 2 batteries - SP6-9HR (6 Volts 9 AH). You must use the existing cables and hardware to connect your UPS batteries.