I know there was something posted about this somewhere before. I searched extensively to try and find it, and was not successful. One of the batteries I have for the KR808D-1 has recently (in the past 2 days) gotten extremely tough to draw on. In other words, it used to be a light draw, and I'd get a lot of vapor out of it. Now it is like trying to suck icecream or a frozen milkshake thru a straw. I have to suck to the point where I feel blood vessels in my brain popping to keep the switch on and getting and vapor out. I've tried dozens of carts, and then tried those same carts on my other batteries, and it is certainly this particular battery. What has happened to the battery, what could this be from, and what can be done to both clean it, and rectify this problem? Or is this battery just a lost cause? Thanks in advance!!