If my math is right, and an 18650 cell has a maximum voltage range of 3.0V-4.2V, then three in series should provide between 9.0V and 12.6 volts.
I believe this is within the specifications for the carrier board. What I’m wondering is if I ran the board off of three of those cells, —and monitored the voltage to trigger a safe shutdown when it drops too low— would I need any other means of voltage regulation?
Assuming I had a method of charging and balancing the cells of course. I figure at about 10 W/h per cell and running 2 sets of 3 in parallel, I could store 60 W/h. That way I could power the compute board, camera, touchscreen, NVME, and something like a cellular data module for something like 4 hours of constant use. More if I switch to 10 watt mode and deep sleep the board when not actively using it.
Would there be any issues with this that I’m not accounting for?