I've just killed my third or fourth battery in 6 years for my Blackbook (A1181), first was Apple, others were chinese compatible. What can I say about this:
- they all die the same way (erratic functioning heading to computer issues, inflating)
- Apple's are consistent in capacity (high to start with), compatible are sometimes same, sometimes less…
- Apple's may last longer (a little…)
- price is not the same definitely.
All in all, given they all die after a year/year and a half, without even reaching the limits they should, I don't see the point to pay the Apple premium in this regard. Especially as the warranty is taylored to not cover the batteries when they fail anyway (far from their supposed limits…)