Mobile phone batteries off eBay

Hey....

Has anyone bought aftermarket batteries off eBay before and not had horror stories to tell?
I am thinking of buying a second battery for my LG G5 for my holiday that states its rated at 3200mah which is slightly bigger than a genuine battery.
Are these unknown makes worth it?

There are a few brands like Anker who are generally ok but otherwise its a lottery with a good chance its a refurb with significantly lower capacity than rated.

I would avoid ebay,better trying the rain forest at least there are reviews there.

ebay batteries are for people who want to live the high life and pretend they own a note7.