Hey,...It does come with a sleeve...havent touched it as of yet..the 26650 30Watt battery is so awesome. It vapes at around 4.2 volts when at a full charge. I have yet to charge the battery...been using it outa the box for what????? 5 days now...LOL...wow never had a battery last this long. Ya dont need 6V on the helix to get a great vape, but for 6V lovers it will work fine, but I wonder if at that time, it just becomes another device at 6V?? Hmmmmm I think the real experience with the Helix is using that mammoth battery at 3.7V Getting that 4.1 or 4.2 outa the box, remember your hitting at 30 watts instead of 15 watts from a 18650 battery.