I havent noticed any issues with my 510 atties on the 5v PT I must say - they work fine, they get hot but 510 atties DO get hot, they get hot when I vape them on the crappy ole normal 510 battery lol. It doesn't shorten their life that Ive noticed.
Candre23 - I keep a spare PT for when mine is being a PITA, I do feel your pain though.