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Strange: 13" MBP has been connected to wall all day, yet battery is very low now

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doxavita

macrumors 6502a
Original poster
Jul 6, 2010
614
3
My MBP, has been connected to the wall all day and the magsafe had a green light. Now the light is amber and when i press the battery indicator light there's very little power left. What's wrong?
 
If you're connected to power, the battery should not drain past 95%; once it hits 95%, it will begin to recharge itself back to 100% which is normal and will help condition the battery.
 
iLog.Genius said:
If you're connected to power, the battery should not drain past 95%; once it hits 95%, it will begin to recharge itself back to 100% which is normal and will help condition the battery.
Click to expand...

Well, In this case it got drained all the way to 18%!!, it's been a little over 1 1/2 hours, and the battery is still recharging...
 
Like dan stated above, it could be the cord but I would try a SMC reset and then try charging again and see if anything changes. If that doesn't work, you might need to swap out power cords.
 
Ok, battery is fully recharged now!, I suspect it had something to do with Rosetta draining my battery.
Let's see how it goes.
 
Well I ran an old chess program called JIN, that program requires Rosetta
 
iBookG4user said:
I highly doubt that you running rosetta is the cause of this problem. Is there any fraying or abnormalities in the power cord?
Click to expand...

Nope, cord is in perfect shape. Although when I noticed, the power adapter's white box was awfully hot and the battery was almost completely empty. (got drained to 18% in 30-45 minutes!) Right now the battery is fully charged (green led) and the box is nice and cool.
 
So should I be worried about this issue?
Can this have damaged my battery in any way?
My battery should still last up to 10 hours a charge right? (especially since my laptop is only 4 days old.)
 
At this point everything seems fine. I'm currently in the process of calibrating my battery. If anything goes wrong I'll reset the SMC. The simple fact that I'm able to use my laptop without it being plugged to the wall should mean the battery is working fine.
 
Was the "box" part of the charger cable covered by anything? If it was, or even if it wasn't, it may have overheated and shut itself off, to prevent damage to the charger. If the charger overheated and it wasn't covered by anything that could insulate it, it may very well be defective. Before you come to the conclusion that you have a faulty power supply, you should try an SMC reset and see if the problem reoccurs.
 
doxavita said:
OK, SMC resets are completely safe, right?
Click to expand...

I've done it probably 10 or so times while testing things. Completely safe. It's what Apple tells you to do when you have certain issues with SMC related functions (such as power).
 
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