Today was my parent's 50th class reunion so they are in town. I have spent all day with them at my sister's and took my 520 with me left the Blu at home. Hubby comes home from work figures he's going to try the Blu. 2 puffs battery dies, gets a different one out starts charging first. This lasts about 1/2 hour, light is out on pcc so he switches batteries, this went on for several hours. Vape switch charge, 2 of my new batteries are already dead, lasted less than a week. He is coming unglued by the time I get home. I hand him my 520 tell him how to use it voila he has nic fix. Then he asks how many times I've switched batteries today, I tell him none. My battery lasted 13 hours before I had to charge again. Problem is he is now eying my 520's....He says he can't believe how much I am using it without battery issues or vapor issues, he's been watching the puff and switch dance for a month now so he is sold on the 520 now. I may have to hide them......