Based on this product's specifications, here are some alternatives and similar models
UPS battery AVACOM AVA-RBC18 Sealed Lead Acid (VRLA), 2 pcs, 2.4 kg each, black
Summary description:
The AVACOM AVA-RBC18 is a sealed lead acid (VRLA) replacement battery pack for UPS systems. The package contains 2 batteries, each weighing 2.4 kg and finished in black. Dimensions are 302 mm wide and 36 mm high. Manufactured in Vietnam and supplied with a 2-year warranty, it provides reliable backup power for UPS units requiring this form factor.