DH and I ordered two sets and we were aware of the 14 day time frame to cancel. I cancelled DH's but kept mine. I then ordered some of their Mboro juice, my favorite until today, and some attys and some carts to refill.
When I emailed to cancel the "savings shipments" of cartridges they refunded the full price of my starter kit. So basically all I paid was $9.95. I lucked out. There was never a charge for DH's kit as I cancelled it within the 14 days and sent the kit back; only initial shipping of $7.95 and cost to ship it back.
The battery does last a long time; several hours or almost a full day of "medium vaping", for whatever that means.
I contacted AquaVaporCig about compatible parts and in a very quick turn-around reply s/he stated, "Our CLASSIC 4081 is compatible."
I've been searching for this info and the only way to know is to order a part to see.
I've read a couple of places that the DirectEcig is compatible with 901 but that was guessing.
About the DirectEcig Mboro juice, 16 mg, way over priced of course. Until today's shipment from Freedom Smoke, it was the only juice that was not too tobacco harsh and/or too sweet. I've tried lots of tobacco flavors and all are too .... something, but mainly too sweet. I've been using it in my eGo for two weeks now. BUT, today FS American Spirit juice came in and it is WONDERFUL. It is very smooth, only slight tobacco taste and aftertaste and only a hint of ...... well it's hard to call it sweet but that's the closest thing.
I want to get another battery for the DirectEcig kit to loan out to friends or have as an emergency backup; haven't decided. It is not a bad vape but not nearly as great as the eGo. The little juice pads are pretty small so I'm getting some aquarium stuff for those. So far I have just been pressing them dry in a paper towel and dripping when I try something sweet or strong flavored. That's mainly what I use it for, dripping to try flavors. I've been washing the attys in 99.95% electronic alcohol that leaves virtually no residuals.
Edit: additional Info
-The battery, on end where atty attaches is marked K100615
-The diameter of the atty screw in part is ~ 10 mm
-The battery has four (4) air notches
-The threads are coarser than my eGo and DH's 801
alice