Well as time goes on with the kr808d-1, I find that I like it with a fresh carto-then its pretty good on the stock batt... But once I refill, the vapor production on the stock batt goes way down. It does still put out pretty good on the passthrough tho. I miss my 801-in fact I find myself reaching for that one when I am just going to use a regular battery-time to buy some more batts and attys I guess.