You can quickly get a MacBook battery replaced. However, different MacBook models have special battery requirements. You'll need to replace your laptop battery with the same type. Also, MacBook batteries are built-in, which means they are not user replaceable. Note that a MacBook battery set can last up to 1,000 complete charge cycles. After which, it will retain less than 80% of its power. That's also when you know that you'll soon replace the batteries.