Ug... beware the auto batteries on any ecig model. I've tried a few and have wasted probably $1000 replacing batteries. I might be wrong, but i think the very nature of an auto battery causes failure. The auto battery is 'open' which means inevitably some juice gets in that little hole. That fries the batteries in short order. Then the only course is to replace the battery. I was frying thru about 3 batteries in 2 weeks before i finally stumbled on the ego with the manual battery (which if you peek into the top, you'll see is 'closed', which means no juice can get in and fry). You'll get used to the button, and save a ton of money. I should probably also be clear that i've NOT used the auto battery with the ego though. You may well have a different experience. I just had bad bad double bad experiences with auto batts on some other models.