We (beginners) are trying to build a paddle streamer with stepper motors and drivers salvages from an old 3D printer. We would like to drive the motors with 12V (or 11.1V) and the control electronics will requires 5V/3.3V (ESP8266 for remote control and/or raspberry pi zero for video streaming from a camera on the boat).
I was thinking of using 3 cell Lipo battery in series but during my research I have found out that each cell needs to be charged separately to prevent over/undercharging. We also would like to have an optional solar panels on the streamer as it will float around freely in a pond most of the day.
We were wondering, what would be the best approach to power such a boat? We are afraid to blow up the battery by making bad choices. For single cells, there are modules, which have all the necessary features (over/under charge protection, overcurrent protection, allowing discharging and charging at the same time? etc.). It has got complicated with 3 cells.
edit: sorry if the question is not specific enough. I can delete it if not fit to be asked here.