I waited for the eGrip to go through a few charge cycles before averaging the time it takes to recharge from the wall-wart. From a totally drained battery to full, it's been taking on average, two hours..
As far as vaping time goes... Out of two days... 6 hours one day, 8 hours the next, @ 11-14 watts. The time is based on my using the device while leaving the house, and conducting daily tasks. I vaped as I normally would with any other regulated device. It is perfect for my intended purpose.. I'm going to grab an automotive 12v outlet >USB adapter to charge while in my car, using the eGrip as a pass through while driving.
It's been great to have something work as described out of the box.. So small, simple, and well made. No leaks, gurgles, or surprises so far.
Thanks for the update. Do you find this device to be limiting as far as changing out liquids/ flavors? Or --maybe you don't change liquids frequently and that's a non issue for you but was curious.