Can I use the old MagSafe connector with the new MBP

I must say that I like the new style MagSafe connector that came with my new MBP. I would like to get an extra to leave in another room, but I'm not hot to pay $79 to Apple for one. I saw an 85 Watt old style connector on eBay for $35. Would the old style work on my new MBP? I don't want to screw it up just to save $44, but if it will work, why buy the $79 unit.
Basically, it would only be serving duty while my MBP is connected to my Time Machine.

As long as it is healthy it will work, Macaby.
Be wary of second hand units that haven't been tested though. Quite a few that haven't been well treated develop weakening of the wires at the points where they enter either the magnetic "head" or the body of the power block. At best these are likely to fail prematurely. At worst they may cause sparks to fly!
OWC sell tested second hand units for a price somewhere in between the eBay "used" price and the cost of a new one, that might be worth a look.
Be wary of cheap third party imitations. The extra few dollars is a small price to pay to avoid the catastrophic consequences that can occur if a badly made power adaptor happens to decide to start a fire!
Cheers
Rod

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