I know pap said he wasn't using a smoore 401 atty, and I would have to guess Kattdaddy isn't using one either. Because I've got 5 dead atty's that say original smoore 401's don't like 5 volts. Not even one tiny bit. Tried it first with a boost converter at 5v, and it blew 3 atty's as fast as I could change em. Checked the voltage on the 3rd one, before it blew, and it was 5.03v. I swapped out the boost converter for a regulator, and got the same result. Tried it one more time with an old, tired atty, and it lasted 1 full hit. Died on the 2nd one.
It's definitely the smoore atty's because I know I'm not the only one. I lowered the voltage to another atty, down to about 4.7v (after I got my new atty's) and It lasted about 40 minutes. I now have it set to exactly 4.4v, which I was told by nuck, in another thread, is probably the safest, maybe 4.5. After that, I can vouch, they don't last long.
On the plus side, they do rock at 4.4v. But dam, they suck down that tiny cart full of juice awful quick.