Banggood state on their website that they work fine or they will accept returns and refunds.
My P3-4K is all on the latest software and works perfectly with these batteries, no issues whatsoever. There are also 100+ reviews there I think saying all good!
So I have three perfectly working non genuine batteries (I started with one of theirs initially) for only a little more than I would have paid for one genuine, so a no brainer for me.
It's a bit like non genuine parts on the car, some are rubbish, but some are perfectly good at a fraction the price of original (and sometimes even made on the same production line!)
Cya