How to Upgrade or Replace the Battery in a 15-Inch MacBook Pro (mid 2018 - 2019)

Introduction

This tutorial will guide you through the process of replacing the battery in a mid-2018 to 2019 15-inch MacBook Pro. Replacing the battery can enhance the performance and lifespan of your device. Please ensure you follow all safety precautions, as handling batteries can pose risks.

Chapter 1: Disabling AutoBoot

Before you begin the replacement, you'll need to temporarily disable the Auto Boot feature on your MacBook Pro.

1. Launch the Terminal application.
2. Enter the following command:

   sudo nvram Auto boot=%00
   

3. Hit Return and enter your password (note: the cursor will not move while typing).
4. Shut down your MacBook Pro and close the lid.

Tip: This step is crucial to prevent the MacBook from turning on unintentionally while you work on it.

Chapter 2: Removing the Original Battery

To safely remove the original battery, follow these steps:

1. Prepare Your Workspace

   • Place a cloth over the keyboard to protect the screen from adhesive spills.

2. Remove the Bottom Cover

   • Unscrew the six pentalobe screws on the bottom cover:
     • Start with the two longer screws on the hinge edge.
     • Remove the four screws along the bottom edge.

3. Detach the Bottom Cover

   • Use a suction cup to lift one front corner and slide a plastic card under the cover to disengage the clips.
   • Repeat on the other side and remove the cover completely.

4. Disconnect the Battery

   • Peel away the plastic covering over the power board.
   • Lift the tab on the cable and gently slide it out.
   • Remove the large Torx T5 screw that holds the power connection and lift the metal tab to disconnect the battery.

5. Remove the Trackpad

   • Unscrew the two Torx T3 screws holding the trackpad connector.
   • Remove nine Torx T5 screws along the edges and four at the front corners.
   • Carefully lift the trackpad and disconnect its cable.

6. Loosen the Logic Board

   • Detach the speaker connectors using a nylon tool.
   • Remove seven Torx screws securing the logic board (different lengths).

7. Remove the Battery

   • Use adhesive remover to loosen the adhesive holding the battery in place:
     • Apply a small amount with a syringe and slide a plastic card under each battery cell.
   • Carefully lift the battery out once freed.

8. Clean the Battery Bay

   • Optional but recommended: Remove any leftover adhesive for a clean surface for the new battery.

Chapter 3: Installing the New Battery

Follow these steps to install the new battery:

1. Reinstall the Trackpad

   • Check for silver washers and slide them over the corresponding posts.
   • Position the trackpad and reconnect its cable.

2. Secure the Trackpad

   • Tighten the four corner screws and then the nine edge screws.

3. Install the New Battery

   • Position the battery in place, routing the cables correctly.
   • Remove any protective plastic from the battery.

4. Reconnect the Logic Board

   • Replace the logic board screws in the reverse order of removal.
   • Reconnect the speaker cables.

5. Secure the Battery

   • Attach the battery connector and secure it with the large T5 screw.
   • Press down and lock the ribbon cable connector.

6. Cover the Battery Board

   • Place the plastic shield over the battery board and secure it.

7. Reattach the Bottom Cover

   • Align the cover and push it towards the hinge edge to engage clips.
   • Replace the six pentalobe screws.

Chapter 4: Calibrating the Power Management System

Once the battery is installed, calibrate the power management system:

1. Plug in the USB-C charger and charge the battery to 100%.
2. Keep it charging for an additional two hours.
3. Open Energy Saver preferences and set all sliders to the right.
4. Disconnect the power and fully discharge the battery until the MacBook shuts down.
5. Leave it off for five hours to ensure complete drainage.
6. Fully charge the battery back to 100% without interruption.

Tip: This process will help the battery report its charge accurately.

Chapter 5: Enable AutoBoot

To reactive Auto Boot:

1. Launch Terminal again.
2. Enter the command:

   sudo nvram Auto boot=%03
   

3. Hit Return and enter your password.

Conclusion

You have successfully replaced the battery in your MacBook Pro and calibrated the power management system. Remember to keep your energy saver settings optimized for your usage. If you need a new battery replacement kit, consider visiting reliable sources such as MacSales. Enjoy your rejuvenated MacBook Pro!