The camera limits the current drawn, not the power supply's ability to deliver. My note above about the current drawn for charging, or use, by the Z6ii, ie 460mA, is way, way below the power 'available' from the powerbank. It's happy to supply 1900mA via USB-C to my Android tablet or external battery chargers. So, Nikon is very cautious about it's power management, so 5 hrs to recharge in-body. PS. Nikon UK is currently Out of Stock for EnEl15C.