As far as I'm concerned a cart is something to haul manure around in. A serious addict needs: 1) enough battery power to last all day; and, 2) enough Niquid capacity to last all day. That means cheap batteries and some kind of tank. The 14650 ePower w/DEUX from Gotvapes fills this bill very nicely. When you grow up, you'll prolly decide to go VV, (Veriable Voltage). The ePower may have a VV switch by then. If not, I like the ProVari. But, the ProVari isn't necessarily a beginner PV. When you finally land on the Niquid you want to use daily. . .roll your own, (DIY). Otherwise. . .you'll be depositing your check at some juice vendor. JMHO
Cheers,
otrpu