It's only suitable for the batteries used on the 26 volt Panasonic unit powered e-bikes sold since 2006. These batteries are mainly made by Panasonic and Kalkhoff-BMZ.
E-bikes using these are BH e-motion, newer Biketec Flyers, Calvin, Gazelle, Gitane, Helkama, Kalkhoff, Kettler, KTM, Monark...