10 of 11 people found the following review helpful
Be wary of buying an actual "Apple" battery, rather than just a compatible one...,
This review is from: Apple MA566G/A MacBook Spare Battery - 80GM model only (Personal Computers)
Be warned that there are some market place sellers who are advertising their products on this page for an official "Apple" battery, but actually shipping 'compatible' batteries instead.
Ensure you buy from a reputable seller (e.g. Amazon themselves) to ensure you get the correct battery.