County Battery Services are continuously investing in their testing laboratories, not only because they need to ensure that the quality of products they supply to their customers, but also a number of customers have a specification for a piece of electrical equipment and it is useful to measure the battery to that particular product.
During the testing process it has come to light that there are a lot of “bogus” batteries on the market especially in the 18650 with products boasting huge capacities. There are also many branded products that appear to be so cheap it arouses suspicion. It does not take much hunting on the web to find evidence of this If you want fake Ultra Fire cells click here
How can you tell if it is not the correct capacity?
Generally the major brands Panasonic Samsung etc set the standards for capacity if it is more power than the companies that have spent the most in R&D then that raises suspicion and perhaps it is worth further investigation.
To test battery the accurately then professional equipment is needed to get a real capacity reading, for the general public it is impractical to purchase such equipment. You can take the battery to a local battery expert such as County Battery Services Ltd or you could use a branded product from a source that you trust put them into the same equipment and time the use! Beware that with lithium based technology battery if the battery management system or the cells are not up to standard you have a potential incendiary bomb!
One of the highest capacity 18650 cells on the market is the Panasonic NCR18650B with 3400mAh if you come across a product with greater capacity it may be useful to be cautious. As can be seen in the link to the Ultrafire battery above cells and batteries can be faked. It is the author’s opinion that you would be better to buy from a reputable source that can authenticate the products they sell