Probably wants a spare. Perhaps if he contacts a battery rebuilder, like FTH, they may know what kind of case is used by the Blik, and they may even tell him, although I am dubious about either possibility. A good ebike shop that sells Blik and other brands should also know, but whether they let the info out is also dubious.
In this case, the battery looks like it could be a Hailong type, but the variables include how many volts, how many AH, and whether it's 4 pins or 5 pins in the cradle.