Hold the battery at an angle and slide the lipped edge of the battery below the brackets on the outside edge of the battery bay. Warning: The internal components of your Mac Book Pro can be warm.
Mac Book Pro (15-inch and 17-inch Core 2 Duo) Note: These models will support only 3 GB total memory.
And go ahead and make sure that the gold strip is completely in the slot.
There is a short side and a long side so make sure it's aligned properly.
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