1 of the 4 26650 Batteries that I ordered has gone faulty. I have examined the battery and there doesn't appear to be any outside defects. The other 3 26650 batteries are working perfectly.It's a shame about that. Other than that you are an Excellent Company to deal with . Actually I intent on making another order of 4 x 26650 Batteries next week. You'll see my order will be placed within the next 7 days. Please do not be discouraged by this comment as this is probably a 1 in a million fault from the Production Line and happens to the best of any Company in the World .