i do vape allot, the extra long batteries are manual, they last a few hours at most, i have tried a bunch of different juices flux, bwb, dtwvapors and a bunch of others. i like a sweet tasting e juice but just cant seam to find what I'm looking for. the v2 red juice i loved but cant buy it in a e juice, dfw had something really close but its gone now and there new juice i cant stand , 4 bottles of it and haven't opened 3 of them , the other has one refill out of it. don't like the nutty taste at all. bwb i had allot of luck with till i changed over to the clearomizers, not sure if i got a bad batch or not but the last order was way to thick i think and it will plug up a normal carto in no time at all , little as one refill, and clean them once a week. so though they were bad and bought new ones, same thing plugs up way to fast, so bought the clearomizers, they also are hard to get any vape out of. it may be the juice I'm not sure. other e juices such as coffee , blueberry and others are fine with the kr808's but still don't get that hard hit out of them. kinda want something that gives you a really hard hit once in a wile. also like the sweet taste of the v2 cowboy or red now. and also like the taste of the bwb hunters blend. not sure if that helps or not.