I need to design battery for computer. I would prefer to use something off the shelf but could not find anything. Basically, I want something similar to laptop battery pack.
What I have now:
Computer powered by a standard 19V laptop power brick.
Motherboard already accepts 19V as input (Intel NUC or something similar), and not very power hungry.
To power up the LCD screen, 19V is also converted into 12V (dc-dc converter, 2A max).
Now I need to have a battery backup for both motherboard and LCD screen. Probably 3 or 4 cells in series but I'm open for suggestions. I think I will use these cells: BL-5C or 18650.
I could not find any simple solution, maybe I just don't use right keywords.
Also would be nice (but not mandatory) if battery pack can communicate with computer just like any standard laptop (show how many charge left, charging/discharging etc.)