I'm working on a robot project that uses three separate raspberry pi's (two Zero W's and one Pi 3 B), and I'm trying to figure out the best way to have them be battery powered without needing 3 separate batteries and 3 separate chargers. Essentially, I want to adapt this idea to three separate boards:
I imagine these are the options and I'm just not sure which is most feasible or would work best:
3 boards, 3 shims, 3 batteries (easy to implement, but pain to charge them and will go dead at different rates)
3 boards, 3 shims, 1 large battery (not sure how to wire this)
3 boards, 1 external charging module, 1 large battery (not sure what module to use or how to wire it)
Any thoughts or suggestions?
EDIT: Just to clarify, the Zero W's will each have a camera module and operate as "eyes" with some minimal pre-processing using OpenCV, and the Pi 3 B will be the proper "brain" of the robot receiving that input (and other sensor input) and controlling motion.