Macbook A1990 Battery serice message. macbook a1990 battery replacement Call 078394111 Applefix 125 ward street Hamilton New Zealand How to replace Macbook A1990 Battery , Below is complete macbook battery replacement guide. Replacing the battery in a MacBook Pro model A1990, or any MacBook model, can be a bit intricate and may void your warranty if not done properly. However, if you're comfortable with hardware and have the necessary tools, you can do it yourself. Here's a general guide: Note: Before starting, ensure you have backed up all your important data and turned off your MacBook. Tools Needed: Pentalobe screwdriver Tri-wing screwdriver Spudger tool or a plastic card New replacement battery Steps: Preparation: Power off your MacBook and disconnect all cables. Place your MacBook on a soft, clean surface to avoid scratches. Remove the bottom case: Unscrew all the Pentalobe screws on the bottom case. Keep them in order as they might be of different lengths. Disconnect the battery: Locate the battery connector on the logic board. It's usually near the center. Use a spudger tool or a plastic card to gently disconnect the battery connector from the logic board. Be careful not to damage the connector or surrounding components. Remove the old battery: The battery is usually secured with adhesive. Gently pry it off from the MacBook's case using a spudger tool. Apply gentle and even pressure to avoid bending or damaging the battery. Install the new battery: Place the new battery in the same position and orientation as the old one. Ensure all connectors are properly aligned and connected. Press down on the battery to secure it in place. Reconnect the battery: Reconnect the battery connector to the logic board. Replace the bottom case: Place the bottom case back onto the MacBook. Screw in all the Pentalobe screws, ensuring they are tightened securely but not overly tight. Power on your MacBook: After replacing the battery, plug in the power adapter and let your MacBook charge for a while before turning it on. Calibration: It's recommended to calibrate your new battery. Let it charge to 100%, then drain it completely until your MacBook shuts off. Charge it back to 100% without interruption. Important Tips: Be extremely careful when handling the battery and other internal components to avoid damage. If you're unsure at any step, consider seeking professional help. Make sure to dispose of the old battery properly, following local regulations for electronic waste disposal. This guide is a general overview and may not cover all specific details of your MacBook model.