Based on this product's specifications, here are some alternatives and similar models
Cordless Tool Backpack Battery Green Cell PTDW18V9 9 Ah 54 V
Summary description:
The Green Cell PTDW18V9 is a cordless tool backpack battery with a capacity of 9 Ah and a voltage of 54 V. It features Lithium-Ion technology, ensuring long-lasting power and efficiency. With dimensions of 84 mm in width, 138 mm in depth, and 95 mm in height, this battery is designed for compatibility with various cordless tools, providing reliable performance for your projects.