The battery is perhaps one of the most underappreciated components. It can have a huge impact on your vaping experience but even vaping veterans sometimes overlook the difference the right battery can make. Box mods have more internal space. This means that a greater number of batteries can be included. Many commercial box mods accept one or two batteries, while a larger 18650 box mod may accept up to four. More battery power results in higher wattage capability, longer life of the device between charges, and a much greater box mod performance.