Hey all, just got my Titan tank the other day and am very impressed so far. I ran into the same issue as you are having.
The trick is to put the battery on the charger after plugging it into a usb port. Attaching the battery beforehand doesn't
seem to trigger the charging circuit.
Thanks so much for the info! I came here looking for answers because we just bought kits and I was having issues charging the batteries. We've only had them a couple of days and I was about ready to call TW but thought I might check online first. So glad I did!
As soon as we plugged them in first and then screwed the batteries on the lights went red and the blue cig lights at the end lit up, which they hadn't done before.