Fuse???
Where did you find this fuse? Is it in the battery compartment? Did you disassemble your battery pack?
Depending on the fuse type they are visual indicators if it is burnt out or not. Is is a wire in a glass tube?
Is is a flattened wire stretched across a ceramic pin? Either will be clearly broken if burned out.
IF it is burned out: you need to fix the cross before you install a new fuse or you will just burn out the new one.