Remove the six 5mm screws securing the battery using the Phillips #0 screwdriver.

Gently disconnect the battery from the motherboard with a plastic opening tool and remove it from the device.

If you're installing a new battery, you should calibrate it after installation.

Charge it to 100% and continue to charge it for an additional two hours. Next, unplug the charger and use the laptop normally to completely drain the battery. Wait at least five hours and recharge the battery to 100%.