this post was submitted on 03 May 2024
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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).
I’d say the motherboard firmware checks if the battery through those two extra pins you correctly assume to have (there are generally 5 pins). And if the battery is not original it refuses to charge the battery.
You can always boot using power adaptor even without batteries and even on apple laptops 😇