Keep critical loads protected without replacing the UPS. APC APCRBC124 is a replacement battery cartridge engineered for Smart-UPS Line Interactive models, including SMC1000i-2U, SMC1500i-2U, SMC1000i, and SMC1500i. It arrives as a complete, tested battery set, charged and ready for installation, so maintenance teams can return the UPS to service quickly. This cartridge uses sealed lead-acid VRLA chemistry with a 24 V, 9 Ah configuration. The spill-proof, maintenance-free design reduces handling risk while supporting dependable runtime restoration in rack and tower environments. Because the battery is hot-swappable, replacement can be performed with less disruption to protected equipment. For infrastructure teams, the value is straightforward: replace the battery, preserve the UPS platform, and avoid the cost and downtime of a full unit swap. APC backs the cartridge with a 2-year warranty, reinforcing its role as the correct service part for keeping compatible Smart-UPS systems aligned to original operating specifications.