Battery type:
Rechargeable Li-Polymer battery. 
Voltage: 11.26V, 
Capacity: 8440mAh/95Wh

Package included:
1 x Battery for A1618
2 x Screwdrivers

Compatible laptop models:MacBook Pro 15" A1398 Late 2013 Mid 2014 Early&Mid 2015:

MacBook Pro 11,2 11,3 Late 2013:

ME293xx/A 15.4"/2.0 Quad-core i7/8GB/256-Flash
ME294xx/A15.4"/2.3 Quad-core i7/16GB/512-Flash

MacBook Pro 11,2 11,3 Mid 2014:

MGXA2xx/A 15.4"/2.2 Quad-core i7/16GB/256-Flash
MGXC2xx/A15.4"/2.5 Quad-core i7/16GB/512-Flash

MacBook Pro 11,4 11,5 Early 2015:

MJLQ2**/A 15.4"/2.2 Quad-core i7/16GB/256GB Flash
MJLT2**/A 15.4"/2.5 Quad-core i7/16GB/512GB Flash
MJLU2**/A 15.4"/2.8 Quad-core i7/16GB/1TB Flash

 

Notice:
Please be noted that this built-in battery is ONLY compatible for Macbook Pro 15" A1398 (Late 2013 Mid 2014 Early&Mid 2015 version).
Not applicable for Macbook Pro 15" A1398 (Mid 2013 Early 2013).