Macbook Pro 60w charger for 15inch

I am using my 2011 15 inch Macbook Pro right now, left my charger at home and am not able to retrieve it right now. I have to get some work done so I am using a friends 60W charger that they actually use for their late 2008 model 15inch Macbook Pro. I have read that it will work but the charging takes longer and it may not charge it fully. But I just want to make sure that it wont be doing any serious damage to my laptop. This thing cost waaay too much money to just let it get messed up over something so small. If anyone has had any experience using a lower wattage charger on a higher wattage machine please let me know your experience. I see it as not doing harm as its only under powering the machine, not over powering. Where I would feel unsafe using a 85W on a 13inch that takes a 60W charger as you could fry it from overcharge. Thanks in advance.
-Brandon

There's no danger charging your 2011 MBP with a 60w cable. You won't fry your laptop, but charging will take longer. Doing the other way around has far greater risks, however.
If you're bullish about safety, why don't you charge from the MagSafe charger, and use the MBP using the internal battery?

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does a usb cable
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I'm not extremely computer savvy with Macs, so bear with me when you give instructions.
I've had this 15'' MacBook Pro since 2010 for when I entered college. I've been using it since this year. Up until the last week my charger has been not charging very well. The ports are clean and well managed, no prongs or pieces have been worn away; physically the notebook and charger have been kept well since I received it.
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Hi there 24ghz!
I've found an article that can help you with troubleshooting any MagSafe issues you may be seeing. The article can be found here:
Apple Portables: Troubleshooting MagSafe adapters
http://support.apple.com/kb/TS1713
Thanks for using the Apple Support Communities!
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Hey
I've got a 2010 15" MacBook Pro - just bought in September - and its awesome.
Got a question though. Will using the MacBook Pro when charged fully, so theres a green light on the MagSafe Adapter, decrease battery life/health?
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No. It's fine to leave it plugged in 95% of the time if that's most convenient for you. Just don't leave it plugged in 100% of the time: us it on battery power for an hour or two every day or two.
http://discussions.apple.com/thread.jspa?threadID=1764220

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Macbook Pro 60w charger for 15inch

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