Apc - Schneider Prem RBC2, Lead-Acid, Compatible with Select APC RBC2 UPS Units, Hot-Swappable, During RBC2 Installation. The replacement APC RBC2 Rechargeable Sealed Lead Acid (SLA) battery meets or exceeds the OEM SLA battery specifications. We guarantee the best price and 100% compatibility with your APC RBC2 model.