Based on this product's specifications, here are some alternatives and similar models
UPS replacement battery AVACOM AVA-RBC9, sealed lead‑acid (SLA), compatible with RBC9 models
Summary description:
Replacement UPS battery AVACOM AVA-RBC9 is a sealed lead‑acid (SLA) unit designed as a direct substitute for RBC9 series batteries. Intended for use in compatible uninterruptible power supplies to restore backup runtime, it is suitable for home, office and small server applications that require reliable short‑term backup power. The battery is maintenance‑free and simple to install, providing a practical solution for replacing worn or failed UPS batteries.