Based on this product's specifications, here are some alternatives and similar models
Rechargeable lead-acid battery FIAMM FUKAWA FW 18-12U 12V 18Ah for UPS and backup systems
Summary description:
FIAMM FUKAWA FW 18-12U is a 12V 18Ah rechargeable sealed lead-acid battery designed for use in UPS, emergency lighting, alarm systems and other backup power applications. The maintenance-free battery offers stable voltage, reliable cycling and compact dimensions for rack or cabinet installation, providing dependable short-term power during outages.