What he said, except so far my VK batts haven't done anything wrong! lol
Had the manual
batteries on my 510 and thought that was the way to go. I didn't like the 510 auto, but it was ok with the manual battery. Honestly, I am loving the Vapor King with auto so much I can't imagine anything topping it. Being me though, and having to have every single gadget for my VK I can get my hands on, I have ordered the manual.
I should have it my Monday and can tell you then if it makes a big difference in my overall enjoyment of the VK...