A trade show floor is one of the worst environments for phone battery life: constant screen-on time for scanning badges and taking notes, weak or congested WiFi forcing the radio to work harder searching for signal, and often no outlet within reach of a booth for eight-plus hours straight.
Screen brightness and cellular signal search are the two biggest drains in that specific scenario. A phone struggling to hold a cellular signal in a crowded convention hall burns noticeably more power than one with a strong signal, since the radio increases transmission power when the connection is weak - this is a bigger factor on a show floor than most people realize, often larger than screen backlight brightness itself.
The practical fix marketing teams land on is carrying one shared power bank per two or three people rather than per person, since not everyone drains simultaneously - badge-scanning duty rotates, so charging can rotate with it. A bank with two output ports lets one person charge while carrying it, rather than needing to sit still at a charging station.
CairoVolt's power banks page lists current options by real output and port count for exactly this kind of shared, all-day use.
