Man I'd been steady at 6 volts on my pv using a hv901 atty..I was running low on atties and decided to pick up a nice pv to operate at 3.7 with a lr510...Otherwise all was good with the 901s...not perfect but good. The lr 510s blew left and right,,,5 in 7 days to be exact..I PMed with a fellow member who was experiencing the same. The supplier claimed ignorance to the fact and offered every excuse in the book. Eventually I got an offer for three free on my next order...I'd blown three at that point...I'm thinking I'd best get back to the hv901s and order 10...Same place I got my good 901s before BTW. They leak onto the voltage output and when you trigger the pv....ZAP! right to the lips!! Seems they are the new and unimproved washer models....I did receive 2 lr 901s that were more than adequate from the faulty 510 dealer...My GG will lite you right on up now...Nothing quiet like having $200 in your pv, $100 worth of new atties, the best TV juice on the planet and you still can't get a good vape...Atties have been giving me Hell the last few weeks....