I was a bit surprised, maybe even mildly alarmed, to see the warning “Service Battery” of my MacBook Pro last week. It showed up when I clicked on the battery icon in the menu bar to see what percentage of charge I had left in my battery.

I waited a few days to see if it would go away, and it didn’t. Hadn’t noticed any particular problems or differences in battery life, though.

Just on a hunch, I turned my laptop over, opened the battery compartment, took the battery out, and then put it back in. Closed up the battery compartment, powered up the laptop, and clicked on the battery icon in the menu bar. No more warning.