Replacement Battery Pack for APC RBC157 Battery Contents Maintenance-free sealed lead-acid battery with suspended electrolyte RBC Assemblies come complete with all required connectors, cable, fuses and metal enclosures where applicable. "No Assembly Required" Pre-Charged, Can be used immediately. Plug and Play and Hot Swappable compatible to simplify installation Installation and Recycling guide included with product Expected Battery Life: 3-5 Years