I've searched all over the web, even reading the user manual...but it seems no one has properly documented the icons this mini shows. It's showing a "battery symbol" that looks full, but won't turn on. Also, I get the exact same symbol even if I put the battery in backwards. Sometimes if I take the battery out and put it back in it shows the "charging symbol". My external charger hasn't come in yet, so I only have the mini to charge with. Any ideas? I feel sick from having to go back to regular smokes again!