Any carto, Nano or CE3, or any other delivery system for that matter, sometimes loses its electrical connection to the battery. This can generally be cured by "lifting" the center post of the Nano, in this case, just a tiny bit. You can use pointed tweezers, a dental pick, a push pin or a similar thin, sharp, relaively strong, object to gently lift the center post that contacts the battery. It only needs to be lifted a little bit, like less than one sixteenth of an inch, to make it work. It can be lifted by prying, gently on one side, then the other. When you're done make sure the post is centered in the shell. Another tip is not to screw any delivery system onto a battery tightly. Just put them on until they feel snug. The same is true for 65 or 78mm
batteries when putting them in the charging adapter.
Just my opinion, worth what you're paying for it, your results and mileage may vary, no warranty or guaranty is expressed or implied.
