16Are watts usually measured in watt-hours? 16Are watts usually measured in watt-hours? 16Are watts usually measured in watt-hours? 16Are watts usually measured in watt-hours? 16Are watts usually measured in watt-hours? 16Are watts usually measured in watt-hours? 16Are watts usually measured in watt-hours? 16Are watts usually measured in watt-hours? 16Are watts usually measured in watt-hours? 16Are watts usually measured in watt-hours?