How hard it is to replace the battery depends on the model of MacBook you have.

If your MacBook is one of the early models that has a user removable battery, replacing it is just a matter of popping the old one out and replacing it with the new battery. However, if you have a model without a removable battery, you will need to open your MacBook’s case. And for that, you will need a guide.

The job essentially consists of these steps:

• Power down the MacBook
• Undo the screws holding down the back cover
• Unplug the battery from the motherboard
• Remove the screws holding down the battery
• Lift the battery out of the MacBook
• Fit new battery
• Screw the battery down
• Refit the connector
• Fit the back cover
• Test the MacBook

A Note on Safety

Lithium-ion batteries like the one inside your MacBook can literally explode. This is something you really need to bear in mind when you are considering a repair job like replacing the battery.