I have my 510 and i carry around right now one of the three 30ml bottles i bought during the Halo sale. I have noticed that during my active days when i go outside alot the juice doesn't last as long. It doesn't support the same amount of puffs that i normally get when i am at home in the nice A/C. im starting to think i need to carry around a lunch pale with those blue ice packs with me. Has anyone else noticed this?