I am building myself a laptop. I have now come to the problem of implementing a lithium battery for it. It will have to power the SBC and the display I use.
Both require 5V; the SBC comes with a 2.5A charger, the LCD has a maximum power consumption of 15W, so 3A.
The charger for the SBC is propably a bit overkill, though I would like to have some room to connect USB devices that also need some power (thinking of harddrives with dual USB for power).
My question is what battery suits my case, and what circuitry I need to not ruin it and to be able to use it in a laptop-like fashion.
First off, I think some UPS-like board would be needed to quickly change between charging/discharging the battery. Do you know where I can get something like that? I searched a lot, but all I find are battery protection boards.
When buying a battery, these will most likely already be included - but can I rely on those when charging and discharging?
And lastly, how does some kind of "fuel gauge" fit in the picture?