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They are the same part number.

There's other things going on that's giving the prolonged times... while you will gain a bit more time due to the increased watt hours HyperThreading is what gives more time on the new machines... so you wont get 10 hrs out of one.

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N.

I was looking for the same answer! My battery is gone and I'm going to replace it.

I have a MacBook Pro 15" unibody with the removable battery....

Thanks!

Someone can just try it? What do "Fixit guys" think? It could be a really good thing!

Thanks

I've been searching for the same answer for a few weeks havent gotten a response.

Just to clear this up....

all the mid 2009 and mid 2010 have internal battery that are not user removable, although they can be, they cant with out tools, and taking the bottom case off. All the MBP "pre" mid 2009 i.e. early 2009, late 2008, and earlier have user removable batteries. They are not interchangeable with the newer MBP i.e. mid 2009 and mid 2010.

Now if you are talking about a mid 2009 and a mid 2010, then thats a different story.

They appear to be the same size and type of battery. but the mid 2010 has a slight longer watt-hour rating on it. i thinks its like 77.5WH compared to 73, not much, but i would take the 77.5 over the 73 anyday. just need to have ifixit test out my theories. (also look up my theory on changing mid 2009 15" MBP LCD panel with the Hi-Res panel used in the mid 2010 15 MBP)