Based on this product's specifications, here are some alternatives and similar models
Rechargeable Battery Pack ANSMANN 2S2P 4×18650 Li‑Ion 7.2V 6700mAh
Summary description:
ANSMANN rechargeable battery pack, configured as 2S2P using four 18650 Li‑Ion cells, provides nominal 7.2 V and 6700 mAh capacity. Designed for replacement power in portable devices, tools or battery holders that accept 7.2 V packs. Offers high energy density and long run time; suitable for domestic, hobby and light professional applications.