Hello everyone. Got my starter kit a few days ago and loving this setup. However, one of my manual batteries seems wonky. When I hit the button, half the time the light doesn't go on and many other times there is no vapor. This happens on every cartomizer that I've tried. No issues with these carts on the other Vapor King bat or PT (both also manuals). Is this just a defective battery or is it something I can fix?