[for parts]Bush Vacuum not working (CB1)

2 in 1 Cordless Vacuum Cleaner
It’s not working. I think it’s battery issue but it’s built-in battery so don’t know how to fix.
I didn’t use all parts and it is well maintained though not thoroughly cleaned.
Now it’s free for parts.

Fair Chance Policy: I’ll wait before choosing a recipient to give more people a chance to reply.