I recently received a new 808d-1 from Nhaler. After charging the batteries and putting on a fresh cart Marlb. cart that was included, I only got a short burst out of the cart. At first I thought that I may have been doing something wrong, so I filled my own cart, took a few primer puffs and that's as far as I got. Now I'm used to vaping a 510, so when I take a long, slow draw off the 808 I get nothing. After sucking fairly hard on the carto, I get the atty to do something for about a second, then it seems like it shuts off. I can suck on the battery with fairly little effort and it lights for at least 5 seconds before hitting cut off. My question is, am I doing something wrong? Shouldn't I be able to vape this 808 with fairly slow draws all the way to cut off? I have tried several carts and I get the same results every time. Please help!