Based on this product's specifications, here are some alternatives and similar models
Rechargeable Li-ion Battery NAC B-40-LI-20V 20V 4Ah for power tools
Summary description:
NAC B-40-LI-20V is a rechargeable 20V Li-ion battery with 4Ah capacity designed for compatible power tools. It provides portable power for drilling, cutting and general workshop tasks, offering stable voltage and extended runtime compared to lower-capacity cells. Suitable as a replacement or spare battery to increase work continuity and reduce downtime.