Based on this product's specifications, here are some alternatives and similar models
UPS battery Gembird BAT-12V4.5AH — sealed lead‑acid 12 V 4.5 Ah, 1 pc, black
Summary description:
Sealed lead‑acid (VRLA) UPS battery Gembird BAT-12V4.5AH, 12 V nominal voltage and 4.5 Ah (4500 mAh) capacity. Single battery pack in black housing, compact dimensions (100×89×70 mm) and weight 1.7 kg. Suitable for replacing or servicing UPS units and backup systems. RoHS compliant. Follow safety warnings: avoid shorting terminals and handle per hazard guidance.