1. You need to turn off your laptop and disconnect the power.
2. Remove the old battery, carefully install the new battery on the battery case, and connect the wiring of the new battery.
3. If you don't understand the above steps, you can search for the video about laptop battery installation on YouTube. Maybe it will help you.
Macbook Pro 15 inch Retina Display ME294 (Mid 2014);
Macbook Pro 15 inch Retina Display ME293 (Late 2013);
Macbook Pro 15 inch Retina Display MJLQ2 MJLT2 MJLU2 (2015).
Fits for MacBook Pro 15'' Retina A1398 (Late 2013, Mid 2014, Early 2015)
Battery A1494 for Macbook pro 15 A1398 (MacBookpro11.2/MacBookpro11.3)
Battery A1618 for Macbook pro 15 A1398 (MacbookPro 11,4/MacbookPro 11,5)
Compatible Model:
Compatible with MacBook Pro 15 inch Retina A1398 (only for Late 2013 Mid 2014 2015 Version)ME293xx/A ME294xx/A MGXA2xx/A MGXC2xx/A MJLQ2xx/A MJLT2xx/A MJLU2xx/A.
1. New battery: For use a new battery, youd better try a few cycles of discharging to 5%. then charging up to 95%. So that it can be activated completely
2. Overuse: Do not always run out of a battery to 0%, this would make it damaged or usage life shortened
3. Charging sequence: when charging, first install the battery, then turn on the power, when fully charged, first cut off the power, then pull the power plug.
4. Long-term storage:Please store the unused battery fully charged.(Charge it once a month) Do not store at low power to prevent reduce the lifespan of a battery
5. Charger: Do not replace the laptop adapter casually. If the original adapter cannot be applied due to malfunction or damage, please replace the models, so as not to reduce the service life of the battery due to incompatibility.
Install A New Battery Compatible Part Number Wide Compatibility Laptop Maintenance Tips