Based on this product's specifications, here are some alternatives and similar models
Battery XCell 9V Block 1200mAh, 9V rechargeable battery, X9V-B
Summary description:
XCell X9V-B is a 9V rechargeable battery (block) with rated capacity 1200mAh. Designed for devices requiring 9V power such as smoke detectors, multimeters, portable audio equipment and other electronic gadgets. Provides reusable power to reduce replacement frequency and is suitable for regular consumer and professional use.