I have 2, and bought my 18 yr old son one as well, and I love them. I plugged them in to one of the USB to wall plug adapters and used them the whole time I was in hubby's hospital room last week. I didn't have to worry about carrying extra batteries because they were plugged in almost all of the time and when I had to leave the room for something they were fully charged. Plus, they are nice and small so they are very inconspicuous and lightweight. I think I like it better with the 302 atty, but that might be because the 801 I tried it with was rather old and may be on it's last legs anyway. It's also really handy since I have a Kensington Power Pack and the stick can run off of it for days. I have no idea how long the battery lasts, because I am rarely away from a power source between using wall outlet to USB, computer USB, and the power pack, but I have used it for over 4 hours on just the battery with no loss of vapor production.