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Since getting my mb-pro 3 years ago, I've only used it as a desktop. A few times, the battery has kicked-in for a few hours while the power was out. Someday, I might want to task it as a laptop. For the sake of the battery :

Should I be unplugging my mb from the wall just to use the battery?
For how long should I run on battery?
How often should I do this?

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Taken from https://web.archive.org/web/20110521104819/http://www.apple.com/batteries/notebooks.html

Standard Maintenance
For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her notebook on the train, then plugs it in at the office to charge. This keeps the battery juices flowing. If on the other hand, you use a desktop computer at work, and save a notebook for infrequent travel, Apple recommends charging and discharging its battery at least once per month. Need a reminder? Add an event to your desktop’s iCal. When your battery no longer holds sufficient charge to meet your needs, you may choose to replace it. If your notebook came with a built-in battery, you should have the battery replaced only by an Apple Authorized Service Provider.

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  • I thought as much... Just started testing it with a 2 (usb3) drives attached under minimal usage. 28" monitor also attached, but that should not use my battery at all I think. I'm hoping for 8-hours.
    – david.t
    Aug 6 '15 at 16:30

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