My secure, wireless, and automated photography workflow relies heavily on power-hungry devices, from a portable Wi-Fi travel router, a Canon EOS 5D Mark IV DSLR, and an iPhone 6S Plus. I have a definite need for supplemental power for each critical component in this workflow.
I’ve been down this path before. In 2009, months before the introduction of the first MiFi device from Novatel, I was using a USB EVDO modem attached to a Cradlepoint Router and an external battery pack to provide hotspot access while traveling to promote my documentary film Autumn Gem. Additionally, my Canon EOS 5D Mark II was equipped with a prototype CF-SD card adapter, which I tried to use with an Eyefi card (I recall having some connectivity and interference problems and it not working as well as I had hoped).
In 2017, USB is the standard for powering portable devices, and there are battery banks and solar chargers that fit everyone’s needs. We’ve certainly come a long way since 2002 when I was testing a solar-powered battery charger for the original Canon EOS 1D DSLR. As you can see from the photo, that arrangement was not practical size-wise nor was it particularly speedy at charging the NP-E3 batteries.
Today, I have two battery setups. One handles casual use and the other covers a intensive day of photography.