Apc - Schneider Prem RBC6, A UPS is a battery backup power source, APC Replacement Battery Cartridge, 2 maintenance-free sealed lead-acid batteries (12V 12ah), Includes All required connectors, Battery recycling guide, Installation guide, Reusable packaging. The brand new replacement battery set for your APC RBC6 includes 2 batteries - SP12-12HR (12 Volts 12 AH). You must use the existing cables and hardware to connect your UPS batteries.