Based on this product's specifications, here are some alternatives and similar models
UPS battery Green Cell AGM06 — 12 V 9 Ah Sealed Lead Acid (VRLA) 95 × 151 × 65 mm, 2.3 kg
Summary description:
Green Cell AGM06 is a sealed lead‑acid (VRLA) UPS battery with 12 V voltage and 9 Ah capacity. Designed for backup power in UPS units and emergency systems, it offers up to 5 years expected life. Compact black housing (95 × 151 × 65 mm) and 2.3 kg weight. Includes one battery; avoid shorting the terminals. Marked with environmental hazard pictogram.