The Vaporesso XROS 4 Nano pushes the small-pod format a bit further than usual. Despite the compact size it carries a 1,350 mAh battery, which is generous and means fewer trips to the charger than most pods this small. A 1.3-inch colour display shows battery and settings clearly, and it takes all XROS pods, so you keep the easy access to a wide range of resistances and the simple refill-and-swap routine. The draw suits a mouth-to-lung style, and the flavour holds up well across the pod's life. It's a good fit for someone who likes a small device but is tired of charging it constantly, since the larger battery is really the headline here. As with the rest of the XROS line, there's not much to set up, which keeps it easy day to day.