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 device's
battery ages chemically, its charging capacity gets smaller.
Maximizing Battery Life and Lifespan
Update to the latest software.
Apple software updates often include advanced energy-saving
technologies, so always make sure your device is using the
latest version of iOS, macOS, or watchOS.
Avoid extreme ambient temperatures.
Your device is designed to perform well in a wide range of
ambient temperatures, with 62° F to 72° F (16° to 22° C) as
the ideal comfort zone. It's especially important to avoid
exposing your device to ambient temperatures higher than
95° F (35° C), which can permanently damage battery capacity.
That is, your battery won't power your device as long on a
Charging the device in high ambient temperatures can damage
it further. Software may limit charging above 80% when the
recommended battery temperatures are exceeded. Even storing
a battery in a hot environment can damage it irreversibly.
When using your device in a very cold environment, you may
notice a decrease in battery life, but this condition is
temporary. Once the battery's temperature returns to its
normal operating range, its performance will return to
normal as well.
Caring for your Surface battery
Microsoft: Battery Status
About battery health management in Mac notebooks
System Preferences > Battery
iPhone Battery and Performance
Settings > Battery > Battery Health