Not trying to take sides in the ft quality issue, but stating what a buddy of mine has experienced and what I have seen.
He buys many different brands, has probably bought at least a hundred ego type battery's from ft..and as many from other vendors. He has seen more returns from his ft battery's than any.
For every 10 ft battery's he has sold,he has had at least 4 returned. The issues have been mostly the battery's seem to charge but don't fire even when positive pin pulled up and basically look like fully functioning battery's otherwise.
Another issue is the pressed fit from connector into battery case is not attached properly, and many have come back pulled apart. This is not due to rough handling by the consumer. He has showed me many straight out of the package with the same issue. Last but not least are bad buttons. They as we'll are not seated properly..
This is all sizes from 650-1000 mah.
As a matter of fact he got so frustrated with them, he sold all the rest he had at $10 each just to get them out of his shop explaining to people the issues they were having.
He has other battery's from other vendors and maybe 4 out of 30 have a button or no charge issue.
Their mods on the other hand, vamos and others seem at this juncture to be really good.
Take the above as you like.it is merely an observation and not a condemnation.
My personal opinion from buying a few clearos and such with the high ohms , leaves me to believe that possibly ft gets some of those as manufacturer seconds that didn't past muster during the qc step.
And while I am not really versed in the business, I did sleep at a holiday inn last night..