Most of the Canon cameras can be used on an external power supply. The aim of this page is to help those who want to use a non-Canon PSU or an external battery power supply to run their cameras. This is essential for very long exposures, and for scripts that run continuously, monitoring a scene, for example, in a security camera or wildlife setting. Please could people add in the pin polarity and voltages that their model of camera can run on. Edit:Hi, here how to build an external Akku with 18650 for Canon (german). And it takes 10'000s of shot's with monitor turned on!