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Re:macOS Icon History by mikestew on Saturday July 05, 2025 @09:32PM (#44477033)
Some models had a small LED bar that you could check the battery status with, without opening the lid.

On older Mac’s (2009-10?), the LEDs were built into the battery. Very handy to quickly check if your spare has more charge than the one you’re using.

Re:macOS Icon History by p_ing on Saturday July 05, 2025 @10:34PM (#44477362)
PowerBook G4 (and iBook, I think) has LED-in-battery.