MacBook Pro :: Battery Draining While Plugged In And Idle?

Mar 9, 2012

This morning I set to work on my laptop as usual. I typically leave it plugged in while not moving around, and today was no exception. I h ave a 15" macbook I purchased in December of 2010, and it's currently running OS X 10.6.8, if that makes a difference.

Anyhow, when I started up my Macbook and set to work, the battery was fully charged (indicator read that it was fully charge, and that the power source was the power adapter). The power adapter light was green. I then stood up and did some work for roughly 2 hours away from the laptop. When Ieft, I put the display to sleep - In the background the machine was still running a webbrowser (reading an all-text page) and preview (a PDF was open). This is nothing out of the oridinary, and I do it all the time usually.

What was unusual was when I returned to my machine after 2 hours of idling (with the display asleep)  to find that my battery had been almost completely drained. The power adapter light was now orange, and the indicator showed that the battery was only 4% charged. The power source was still displayed as the power adapter.

I understand that during intense processses the Macbook will draw from the battery AND the power adapter - But my Macbook was simply idling! I can't fathom that a webbrowser and Preview would require THAT much draw for power. In fact, I've run my Macbook MUCH more intensely for much longer periods of time when running Final Cut and Adobe After Effects and NEVER seen this issue before.

Is this an indication of a failing battery? Ever since I noticed this, the charging time indicated has held steady at ~1:13 (that's been about a half an hour now). I don't know if the Macbook will discharge the battery completely every so often by itself, or if the battery is just failing and that's why it went from 100% to 4% in just under two hours while idle.

MacBook Pro, Mac OS X (10.6.8)

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Oct 17, 2009

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Jun 2, 2014

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Jun 24, 2014

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Oct 23, 2010

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Oct 2, 2009

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Jun 24, 2010

The title says it all, basically my MBP's battery drains even if the computer is plugged. When I sat at my desk to use my MBP earlier today I noticed the battery was charging. That seemed very weired, I was sure it was at 98% last night. I decided to switch my computer off and let it charge all the way up.

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May 18, 2012

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Oct 12, 2010

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Mar 20, 2010

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Jul 28, 2010

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MacBook Pro, Mac OS X (10.7.2), iPad 2, iPhone 4S

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Jun 2, 2008

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