Battery Backup With Power Adapter

When the Power Adapter is being used to power the laptop, does the battery take over when the main power to the power adapter is interrupted?

With respect to your system shutting off when power is interrupted, yes. However, it's no protection against power anomalies such as surges which can blow your MBP away.
While it does mean you can do away with a UPS it does not mean you can do away with surge protection. FWIW I still use UPS power whenever possible with my MBP as I prefer not to put my power adapter and other circuitry under any unnecessary strain due to irregular power.

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    remcodebtje
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    hi Rene!
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  • 2009 Macbook Pro's fan spin faster with power adapter plugged in?

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  • MBP discharges battery even while power adapter plugged in.

    Just recently, my MBP started discharging its battery even while the power adapter was plugged in. Eventually, it goes dead and shuts itself off, then starts recharging. I've turned off bluetooth and airport, going to a wired/plug in mouse, but that doesn't stop it, nor does changing to "better energy savings" while on Power Adapter. While it is going down, time of course remains "Calculating until full" -- I've checked the pins, and even spent 3 hours yesterday driving to the apple store, waiting, getting a new batter from the genius, and driving back home. Then it happened again with the new battery this morning, after it was fully charged last night.
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    Have the MBP repaired via AppleCare. Just let them know what it's doing. I'd guess at a fault in the charging circuit, but this is obviously not normal behaviour!

  • 2nd Gen Shuffles charge with power adapter, not seen at all by computer

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    Nobody has any ideas?

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