I have been using three Riva batteries for the last couple of months with low resistance cartomizers. They have been great. This morning I put a fresh LR carto on a freshly charged Riva battery and it started blinking. I thought that was funny, but maybe that battery wasn't charged...so I put it on another battery and the same thing happened. I did not try it on my last battery! I did try other cartos on those batteries and they now appear to be dead. Could that cartomizer have been wired wrong and cause the batteries to short out? I am seriously bummed!