These are "genuine" original Samsung batteries from legit EU online stores. They lasted for a few months and now decided to blow out. There is absolutely no difference between this and what you can get from AliExpress.
I really wish vendors opened official stores with replacement parts.
@schmaker I don't think those are Samsung batteries. I've had quite many Samsung devices and never a problem with battery. The original one in the tablet lasted for 5 years. It looks like I now managed to buy an original one finally because it seems to be working correctly, but before that I bought those two and basically wasted money.
For people who care about, support, or build Free, Libre, and Open Source Software (FLOSS).