If the electronic paper screen is a traffic sign mounted at a remote
location, without Wi - Fi access, you can reasonably expect that the outside temperature fluctuations and the sign's
cellular connectivity will make it necessary to charge the battery more often than you would if the
same size sign was located indoors, next to a Wi - Fi router.
In testing in a
location where both Wi - Fi and
cellular LTE signals were strong, an hour of browsing over Wi - Fi used roughly the
same amount of battery power as an hour using LTE on an iPhone.