![](https://lemmy.world/pictrs/image/db690364-ab14-466c-b27b-579c35754f9c.png)
![](https://lemmy.world/pictrs/image/4271bdc6-5114-4749-a5a9-afbc82a99c78.png)
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).
https://www.datarequests.org/blog/sample-letter-gdpr-erasure-request/