Apple update changes how Macs charge to protect their battery life

Apple is rolling out a new feature called "battery health management" that will change how laptops charge themselves. The update will mean that laptops may not charge themselves all the way up all of the time, if the computer believes doing so will protect the life of the battery. It aims to avoid a problem that means fully charging a laptop's battery puts a strain on it, because of the chemicals inside. Leaving a computer charged up in this way can therefore reduce its capacity, leading the battery life to fall over time. Instead, if the computer believes that it is not likely to need 100 per cent battery in the future, it will only charge up some of the way.