Oh yeah - I forgot. I did once get a few fasttech Ego batteries that were like $4.
They crapped out after a couple months, tops. I've got other, better ones still running fine that are well over a year old.
(On the other hand, I have been overall very pleased with fasttech purchases - tons of drip tips, even an Innokin (yes, legit) SVD, etc. They do sell crappy copies of stuff, but they don't LIE and claim it's brand - ie: if it says "Authentic Kanger" then it really is.)
They crapped out after a couple months, tops. I've got other, better ones still running fine that are well over a year old.
(On the other hand, I have been overall very pleased with fasttech purchases - tons of drip tips, even an Innokin (yes, legit) SVD, etc. They do sell crappy copies of stuff, but they don't LIE and claim it's brand - ie: if it says "Authentic Kanger" then it really is.)