Hello...I have read through some of the posts and have not found what I need. Sorry if this seems like a stupid question. I was using the blu and emist and went back to smoking for about 6 months. When I tried to use the blu again...all 5 batteries were not taking a charge...the emist still worked...but not very well. I ordered the (I think 910) on value vapor. It has a hole (automatic?) in the atty. Am I suppossed to cover this when I vape, or leave it open? How many drops of liquid do I put in? I love how this one creates more "smoke" and gives a stronger hit