Do you know how many charge cycles your Macbook battery has gone through? Knowing this information can help you determine when it's time to replace the battery. The battery is designed to retain up to 80% of its original charging capacity at its maximum number of cycles. To get the best performance out of your Macbook, it's important to replace the battery when you reach its maximum number of cycles. To find out how many charge cycles your battery has gone through, check the power section in the system information section of your Mac.
This will tell you how many charging cycles your battery has performed. Compare this number with the maximum number of cycles for your model and consider replacing the battery if you are close to or above that number.