eGo t mystery failure

The charger indicates the battery is charged. I connect it to the tank and the button gives those multiple blinks indicating it is discharged. I tried it on the USB port, and again, there is a full charge indication from the charger, but not when set up and pushing the button. I tried this with both batteries; same result. Now, when I switched to the backup tank, everything works. Clearly, there is something wrong with one tank (or whatever it's called) but I can't imagine where the problem is. The set up is only about a week old, if that matters.

Has anyone even seen something like this? I'd rather a cure than a shared experience, but I'll take whatever I can get.

 

By elimination, that has to be it. I'll be in Albuquerque on friday, and if the store is open after the 4th, they will have an opportunity to gain or lose a potential long term customer. Hate to be a pest, but nothing should fail that soon. Thanks