It converts the charger voltage to run your Mac and charges the battery. It stores power (charging) and provides power (discharging). It delivers power to your MacBook and its battery. Any of these components gone wrong would cause the MacBook Air or MacBook Pro not charging.

MacBook battery charging system consists of four components: a charger, a battery, a charging circuit and an SMC chip. If your MacBook can not turn on, see our article MacBook Won’t Turn On? 10 Ways To Fix It. In other words, the MacBook has no sign of life at all. On the other hand, a “MacBook not turning on” problem means that when you press the power button on the MacBook keyboard, no matter you connect a working charger to it or not, you can’t see anything on the Mac screen, no chime, no light on the keyboard and no fan-spinning noise. A MacBook with battery charging problem can be turned on if you connect a working charger to it. Many people get confused between “MacBook battery not charging” and “MacBook not turning on”. But if you remove the charger, the MacBook will turn off instantly. The status menu shows your battery is normal and fully charged.You don’t have a green light or orange light on the MagSafe connector.You have the message “No battery available' in the status menu.You get the message “Battery is not charging' in the status menu.The following symptoms indicate that you have a MacBook Air or MacBook Pro not charging problem: In other words, your MacBook is mostly working well except for the battery charging function. A MacBook battery not charging problem means that you can turn on your MacBook, but the charger will not charge the battery.

Apple new battery for mac