*Some models had a small LED bar that you could check the battery status with, w...

		mikestew 6 months ago \| parent \| context \| favorite \| on: macOS Icon History 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.

PowerBook G4 (and iBook, I think) has LED-in-battery.