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Chapter 11. Trouble To Go: Portable Macs... > Problems Running on Battery Power

Problems Running on Battery Power

Symptoms:

  • After following procedures to recharge a battery, the battery remains uncharged.

  • The battery indicator in the Control Strip (or other similar utility) indicates that the battery is nearly out of power even though you just recharged it.

  • The battery successfully charges but then drains its charge much more rapidly than expected.

  • The portable Mac will not start up at all with battery power but works normally when using AC power.

Causes:
  • The power adapter may be defective or not plugged in correctly. Or it may be the wrong power adapter for your portable Mac.

  • The battery may have had a "deep discharge."

  • The battery may be dead, or nearly so, and need to be replaced. This is especially likely if the battery either never successfully recharges or loses its charge very rapidly.

  • The Power Manager's data may have become corrupted.

  • A corrupted PRAM may also cause these symptoms.

  • Finally, you may be using your portable Mac in a way that excessively drains battery power.


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