This is a good little dual 18650 mod. 157 watts is plenty of power for my needs. The battery life isn't the longest compared to other dual 18650 mods I have running at the same ohm and wattage level. I can still get through most of a day on a set of batteries but that will depend on what ohm you are running, the wattage you are vaping at, and how much you vape. I love the look and it is pretty comfortable in the hand.