What is the valid capacity ranges of Lithium Ion 18650 batteries?
Obviously when you already have one in your hands, you can measure its true capacity.

However lets for a moment think about where these fake cells might come from:


Cheap companies that have little expertise in bleeding edge battery technology
Contracted factories that just leave the machines running for a while after they produce the parts for high end battery companies


In the first case you can be sure that the real capacity is on a much lower level.

In the second case the capacity is at most at the level of the best competitors on the market.

In conclusion: anything that is above the well established brand names is a blatant lie. Anything that is at their level might be a lie or could be true, no way to figure out than to measure it.