Bottom case swap between late-08 to mid-09 A1286?
I bought a mid-09 MBP to replace my late-08 that had an unfortunate accident with a bottle of Pepsi last year. This new computer has the solid base, as opposed to the one on my late-08 model which had the battery door. Can I swap the old battery door-having base onto the newer mid-09 model?
No - The "Mid-2009" models have a built-in non-swappable battery design -- like the previously introduced and subsequently discontinued MacBook Pro "Core 2 Duo" 2.66 17-Inch (Unibody) -- and this battery is not designed to be removed or serviced by end users. The battery is completely different to the point even with a "door" you couldn't swap it. I doubt other internal components would line up/fit the older bottom.
If this answer was helpful please remember to mark it accepted.