This article only applies to Mac computers with Apple silicon.
About the lithium-ion battery in your Mac notebook
Mac notebook batteries use lithium-ion technology. Lithium-ion batteries charge quickly, are long-lasting and currently provide the best technology to power your computer.
All rechargeable batteries are consumable components that become less effective as they get older — and their age isn't determined only by time. A battery's lifespan depends on its chemical age, which is affected by factors such as its temperature history and charging pattern. As your notebook's battery ages chemically, its charging capacity gets smaller.
With these tips for maximising battery performance, you can get the most out of all your Apple devices. And with battery health management, your Mac notebook can take battery optimisation even further.
Your battery's maximum capacity
Maximum battery capacity measures the device battery capacity relative to when it was new. A battery will have lower capacity as the battery chemically ages which may result in fewer hours of usage between charges. Depending on the length of time between when your computer was made and when you start using it, your battery capacity may show as slightly less than 100%.
A normal battery is designed to retain up to 80% of its original capacity at its maximum cycle count when operating under normal conditions. The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge.
How battery health management helps
Battery health management is designed to improve your battery's lifespan by reducing the rate at which it chemically ages. The feature does this by monitoring your battery's temperature history and its charging patterns.
Based on the measurements that it collects, battery health management may temporarily reduce your battery's maximum charge. This happens as needed to ensure that your battery charges to a level that's optimised for your usage — reducing wear on the battery, and slowing its chemical ageing.
If you feel that your battery isn't lasting as long as it should, you can learn about getting service for your Mac notebook.