A:
Sorry to say if you have that model, you can Google the manual for that answer. The model I have, totally enclosed case, around the brush and there isn't a way to open it. Does not say anything about removable batteries.
If you buy the Geek squad warranty on the Bissell, and it stops charging, it will be replaced with the same model.
To sum up, always buy the warranty. It's 8 bucks for 3 years and never worry about it. Or Google the manual and maybe theirs an answer there. Sorry hope this will help some. Stay well.