Based on this product's specifications, here are some alternatives and similar models
BLOW UPS battery 82-217# — 12 V 15 Ah, single 12V battery, black, 4.1 kg
Summary description:
Sealed lead-acid UPS replacement battery BLOW 82-217# with nominal voltage 12 V and capacity 15 Ah. Supplied as a single 12 V battery in black housing, weight 4.1 kg and compact dimensions (149 × 102 mm height/width). Designed for use in UPS systems and standby power applications to provide short-term backup power and reliable replacement for compatible units.