60w chargers not working on 13-inch MacBook but 85w does. What is wrong?

Hi. My 60w charger won't work on my 13-inch MacBook, so I tried 2 others including one brand new one but none worked. Then I tried a charger from a 15-inch (85w) and it worked. ***!?
I was told that I shouldn't use the 85w because it could fry my battery.
What is wrong with it? What should I do.
Message was edited by: PCH2494

You may need to download and apply the SMC firmware update:
http://support.apple.com/kb/DL1312
I was told that I shouldn't use the 85w because it could fry my battery.
False. You can use the 85w without worries.

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