BEFORE / AFTER
Officially, when the battery life of a 13-Inch “Unibody” MacBook Pro has fallen enough to justify replacement, you are required to provide Apple with the entire computer to perform the battery swap.
Unlike the 15-Inch models, all 13-Inch “Unibody” MacBook Pro models use the same battery and the same screwdrivers, so precise identification almost isn’t necessary.
However, for those who appreciate precision, the 13-Inch “Unibody” MacBook Pro models can be identified by the Model Identifier “closely enough” to an exact match for the purpose of replacing the battery. In turn, each model can be uniquely identified via model identifier and one or more secondary identifiers (like processor speed and/or processor type).