Counterfeiting electronics is a big deal, especially when safety is concerned. Teardowns sometime show VERY sophisticated imitations.
Batteries are a big problem here
I grew up with a family of pawnbrokers. who said "If you don't know diamonds, l know your jeweler."
Amazon FBA (Fulfilment By Amazon" can be problematic, they do not vet the vendors well. QA is by just making them give you money back ,rather than fixing the problems.
This allow problems to persist.
Not just a battery issue, but it means you have to know what you are up against.