High wattage box mod kits are box mod kits with extra power available through a multiple battery set up. Commonly having two or three batteries however, there are now kits available with four batteries to provide the maximum amount of power. More batteries will mean more power but this is offset by the bulkier size of the unit.
High wattage kits tend to be used by intermediate or advanced vapours. Although bulkier, they provide the best performance and customisable options. Those who prefer to use an RDA over a tank tend to prefer a high wattage model.