We loved FastMac's TruePower MacBook Pro batteries at CES and MacWorld, which kept us going long after the standard MBP battery would have given out. That's why we recommend these FastMac MacBook batteries MacBook owners that need backup power for the road.
They come in both white and black models to fit your color, and run only $99.95, $30 less than the $129 the standard one costs. You can pre-order now, which will ship in about 30 days. There's nothing like popping in a freshly charged battery when you're low on juice and hearing, "Sir? Please, your wife's having a sonogram and I think that's interfering with our systems."