Important to find for MacBook model number: About this Mac --> More info... --> Serial number--> Check your for MacBook's version on official website or Google with the SN. (Please check the for MacBook Pro Model Number on the laptop back case and Make Sure Your Own Laptop Battery Model Before Place Order!)

Specification:
Battery type: Li-ion
Voltage:11.42V
Capacity: 6559mAh / 74.9Wh
Cells: 6 Cell
recharge cycles: 500
Operation time: Around 1.5-3hours

Tips: You can check the back of your for MacBook to confirm the model. 

For Apple MacBook Pro 13 inch A1502 Retina Early 2015 
For Apple MacBook Pro 13 inch A1502 Retina Mid 2014 
For Apple MacBook Pro 13 inch A1502 Retina Late 2013 

Compatible with For MacBook Pro Part Numbers: 
MJLU2LL/A, MF839LL/A, MF841LL/A MGX92LL/A, MGX72LL/A, BTO/CTO ME864LL/A, MGX72LL/A, ME867LL/A