Based on this product's specifications, here are some alternatives and similar models
Battery for 360 Robot S5 14.8V 2.6Ah Li-ion by extra digital
Summary description:
Rechargeable Li‑ion battery designed for the 360 Robot S5 robot vacuum. Specification: 14.8 V nominal voltage and 2.6 Ah capacity. Intended as a replacement or spare power source to restore runtime and maintain cleaning performance. Suitable for users needing a direct-fit battery to extend working time and ensure reliable operation of the device.