They can take a while first charge, but once that first charge is out of the way, it will get quicker...lol.
I take it that you are charging up the 18650's? once charged those beauties last me 30 hours vaping time..
The Tenergie batteries, work differently. They take a long time to initially charge, but will not last very long at all, and you will think they are a waste of money.. thats only because they are a 'slow build up battery' ( my term not technical ) and they have to be charged up to 5 times to really get the benefit.
One thing I have noticed already, and be aware.. Keep The Atomiser Moist.. so a couple of drops regular, if not you will get the burnt taste and fast...lol
Not to mention the loss of your atomiser... simply keeping it moist, will keep it alive, even at 6v, should that be your vaping delight..