This is a guest post written by Morandir835, an e-cig enthusiast, admin on the Vapor4Life forum, and a regular on their ECF sub forum. I've spent a lot of time putting every battery in my possession  through the wringer. I've used dual coil cartos on them (mind you this used to be a big no-no  for "stick" batts), low resistance cartos, and chain vaped them like nobody's business. What I've learned from it all are a few key points. Batteries V4L's Vapor King Diamond and Stealth series batteries can take more punishment  than any other batt of comparable size. Save for batt life, these beat out the fat batts and a few of the lower end non-variable voltage/high voltage mods on the market in their voltage holding capabilities. With proper care you can get 300+ charges out of these batteries, which is not bad for something that costs under $30. Tanks The tanks V4L  carries are some of the best tanks on the market in terms of durability, ease of use,  and price. I was  recently gifted a very high-priced  rare tank, and while it looks pretty, I have to punch my own cartos, use standard sized ones, and it has  a few leak issues. I wouldn't even dare trying to use a high mint (cinnamon specifically) juice in it for fear of breaking the tank. The V4L  metal capped tanks are made  with a  material  that can handle the higher mint content juices without cracking.  The fact that they offer a range of ohms and coil set ups  for the replacement cartos is a major plus as well. Cartos Out of  the hundreds of  V4L WOW cartos and CoolCarts (cartomizers) I've gone through,  just 1.5% came dead on arrival (the carto  didn't work fresh out of the box). I can get an average of 7-8 refills out of them depending on what juice I'm using (juices with a higher VG concentration will kill  a carto  faster than one with more PG). The ohm range is a little wide on both (2.1 to 2.7 on WOW cartos, 3.0 to 3.7 on CoolCarts), but they're pretty consistent with their averages (2.3ohm for WOWs and 3.3ohm for CoolCarts). The features that shine through the most in all my tests is simplicity, durability and ease of use. Contact Morandir835 via e-mail at [email protected] or through his page on ECF at http://www.e-cigarette-forum.com/forum/members/51087/morandir835.html "Even Though I Nothing Learned, With Strength I Burned." - Emperor