Q: Magsafe power adapter

Theoretically, it would be all right, but if you're going to buy one, why not buy the correct one?

Check out this support article >  Apple Portables: Troubleshooting MagSafe adapters

The 85 watt adapter will not harm your MBP.  Whether it will charge you battery ant faster, I don't know.

Ciao.

It will work just fine. Using an adapter of higher wattage than the adapter that came with the computer will not cause the computer to charge more quickly or otherwise operate any differently than using the adapter that came with the computer. You should never use an adapter of less wattage than what came with your computer, but higher is OK.

Apple even states such here:

http://support.apple.com/kb/HT2346

OGELTHORPE wrote:

  Whether it will charge you battery ant faster, I don't know.

It won't. The computer actually DRAWS power vs pwer being fed.

The 85W charger might charge your battery at some times when a 60W adapter won't, though. When your machine is running under very heavy load, the 60W unit may stop charging to make additional power available to the processors. That's much less likely to happen with the 85W adapter.