Just FYI for my fellow newbies, my local big chain of gas stations here sells a PV for $20 along with separate packs of 3 carts for $10. After I bought my current "real" PV, I almost threw out the gas station brand battery and emptied carts. Reading up on here, I cleaned out the carts, and I am now filling them with my liquids. Also the "real" PV I bought, has atomizers that screw onto my old gas station battery and also the battery fits on the smaller threads of my tanks. So just FYI, if you have one of these, don't throw it out. It's become a valuable backup in my arsenal of PV's in case I have an issue or dead battery with my main units.
