[V.V. Passthrough] 650/900mAh(Variable Volt) USB battery(Passthrough) for 510/eGo - $21.00 : Healthcabin Electronic Cigarettes - Wholesale and Retail--his is a 650/900mAh VV Ego passthrough battery. Has three different voltage settings, just like the joyetech passthrough, but this one is a standalone battery also, like the Ego passthrough batteries. Seems like an interesting device. Just curious if anyone had experience with these.