If your product is still under warranty, you should get the battery replaced by Apple it's covered under AppleCare if that is still in effect. This being a 2015 MacBook, it's unusual for a battery to have such a short lifespan, though it's not unheard of.īatteries typically have a useful life of 3 to 5 years. Even though it has calculated 75% charge left, the voltage drops too low too quickly and the MacBook will turn off/go to sleep.īasically, your battery can no longer hold a charge and is going into hibernate/sleep mode. What's happening with your battery is that it can no longer hold a charge. When the battery drops below a certain amount of voltage, the overcharge/undercharge protection circuit kicks in and kills power to the device. The "75% battery remaining" is a calculation based on how much charge the battery has verses it's full capacity and the electrical current it's capable of delivering at that moment. This first generation Macbook 12 inch was showing 75% battery remaining. If a battery driven device (a MacBook in this case) doesn't turn on without the AC adapter plugged in it means that the battery cannot supply enough current to power the device.
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