I have batteries with crazy misspellings and wrong words - they say those are a sign of being fake. I bought them from very reputable vaper suppliers - they work fine.
Considering 90% of the vapor suppliers buy from china (alibaba.com) - your going to get some fake batteries. Even at the most reputable suppliers it has happened. Im sure i have some fakes, and if you have 10 or so different batteries laying around - im sure you have some fakes too. I would say avoid most ebay sellers because chances are your are defiantly buying fakes. Don't assume USA sellers have better batteries - most buy them from China - they are just the middle man. The fact is you just don't know.