mac diddy

Part 3: Make the battery last.

Battery technology has come a long way, but there’s still a long way to go. When your Macbook is new, its battery life is great and all is well in the universe. But the honeymoon doesn’t last. Used batteries hold their charge for less and less time and they can be expensive to replace, especially for Mac users.

A battery is only good for so many cycles, one cycle representing a battery going from completely charged to completely depleted and then completely charged again. If you run your battery down to 50 percent and recharge it, that’s a half cycle. If you have a white or black Macbook, the battery is only good for a couple of hundred cycles and they add up quickly. A new aluminum Macbook Pro has a new/improved battery which will supposedly be good for several times the life of the older battery types, which is a good thing because they’ll be more difficult and more expensive to replace. Let’s start with an all-too common myth.

Myth: you should always run down a battery all the way before recharging it.

I’m often surprised by how many people work under this assumption. This belief is a throwback to a truth from the days of nickel-cadmium batteries, but no longer relevant in the world of Lithium Ion batteries like those found in Macbooks. In fact, Lithium Ion batteries “like” to be charged and will last longer if you don’t let them fall below 50% too regularly.

However, there are reasons to let your battery deplete all the way once in a while: if you let your computer run until it completely runs out of juice and goes into “deep sleep”, then you are effectively resetting or recalibrating the battery life meter. Or if you’re a laptop user who most of the time happens to use the laptop plugged-in at a desktop, Apple suggests that you run the Macbook on battery once per month in order to cycle the battery.

Did you know that you can check how many times your battery has been cycled? Open up the System Profiler (Macintosh HD->Applications->Utilities) and click on Power in the column on the left. You should find the Cycle Count along with other details.