I'm being a bit more cautious in my atomizer purchases lately. I've spent hundreds on different setups (attys) and several have been either PIF'd or sold. One think I haven't found, or I just wasn't paying attention, is it top or bottom fill?
ETA: How does it maximize battery life? Isn't that dependent on what ohm coil and what wattage you're running?? Never known a tank to "maximize battery life". How does that work??
The PV circuit is best modeled by two resistors in series. One resistor is the coil, the other resistor is the accumulated unwanted resistance from the various electro-mechanical connections between the coil and the " battery". Those unwanted resistances are fixed, regardless of coil resistance. The lower the coil resistance the larger portion of total power dissipated is in the unwanted extraneous contact resistances. So if, for example, your objective is to deliver 20W to the coil, if the unwanted resistance is equal to the coil resistance then you will dissipate 20W of power in the unwanted resistance. You would expend 40W to deliver 20W. Zen previously posted a chart illustrating the relative wasted power at various resistances from about 0.15R to about 2R, assuming a 0.15R total extraneous circuit resistance.