A MacBook Pro and a Dying Battery

 

Since I have a very powerful Mac Pro humming away under my desk I don't use my MacBook Pro too often. I'll take it when I travel but don't use it on battery power too often. Since I bought the machine about 18 months ago I've only cycled the battery 47 times according to System Profiler.

 

While traveling over Thanksgiving I pulled the MBP from my bag, powered it up and started happily working away. Oddly the battery indicator—which should show a full charge—rapidly dropped to 92%. Within about 15 minutes my battery power was already dropping below 70%.

 

I kept working away, popping open some web sites and updating a spreadsheet with some of the data I was looking up. I glanced up at the battery gauge and saw that it was already down in the 40% range after only about 20 minutes of use when suddenly my MBP shut down.

 

This wasn't a graceful "I'm going to sleep now" shut down. There were no warnings, no kernel panics and no obvious signs of distress from my Mac. The screen just went black. I had about 3 seconds of noise from the fans and hard drive spinning down while I contemplated what had just happened. Did I save what I was working on? Did I really only get 20 minutes of use out of my battery?

 

I closed the MBP and flipped it over, pushed the little battery indicator button and two little green lights winked back at me. Odd. I pressed the power button and the MBP started to boot up. It was nearly through the boot process when it decided to give up and shut down again.

 

I grabbed my power cord, plugged the machine in and booted it up. It came up fine, no issues and dutifully reported that it was charging the battery. I remembered that I had recently seen an article on calibrating the battery from Apple. The process was simple:

Get the machine fully recharged then let it rest in that state for at least 2 hours. Once charged, unplug the power and run it down until the machine goes into a sleep state. Let it stay in sleep mode for at least 5 hours to fully exhaust the battery. Recharge from there and you are ready to go.

The problem was, the machine would shut off well before I got down too low on the battery. I decided to get it as close to the "shut down zone" as I could (about 40%), then put the machine to sleep. The graceful pulsating light told me it was happily slumbering away. I left it like that to see how long the battery would last while preserving the memory in sleep mode.

 

Three days later I lost patience and tried to wake it from sleep mode while still disconnected from power. Though the light was still pulsing I couldn't wake the machine. Not completely dead, it appeared to be in a coma. I reconnected power, turned on the machine and it quickly restored itself. The battery gauge was registering numbers all over the map and after it charged fully it indicated that I needed to "Service Battery":

 

 

At this point I'll try taking it into to my local Apple store and see how they deal with it. I have an Apple Care extended warranty though I'm not sure if they will cover the battery with that. Stay tuned and I'll post an update once I learn the outcome. I posted a note about this on Twitter and got lots of responses telling me that Apple quickly replaced their batteries for them. Then again, I also got a link to this page about Apple's battery policy.

 

Had a battery issue with a MacBook Pro? Did you get a resolution that worked for you? Drop a note in the comments and let me know!