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How is it that one cannot purchase a bunch of flat rectangular batteries and just put them inside the laptop (wherever they fit) and connect them manually to some custom charge controller? We do it all the time on other devices like drones and shit. We have generic round cylindrical batteries, why isn’t there flat generic Li batteries?
I’ve not worked with batteries but I would assume there are two pins for voltage and ground, one temperature probe pin and or two pins for serial communication (probably I²C). If batteries would have had some sort complex handshake then it would have needed a corresponding UEFI patch so that system is able to refuse booting if the power level is too low. That’s why I assume there would be no handshake (unless it’s apple ofc).