Apple software updates often include advanced energy-saving technologies, so always make sure your device is using the latest version of iOS, watchOS or OS X.
Your device is designed to perform well in a wide range of ambient temperatures, with 16° to 22° C (62° to 72° F) as the ideal comfort zone. It’s especially important to avoid exposing your device to ambient temperatures higher than 35° C (95° F), which can permanently damage battery capacity. That is, your battery won’t power your device as long on a given charge. Charging the device in high ambient temperatures can damage it further. 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.
iPhone, iPad, Apple Watch and iPod work best at 0° to 35° C (32° to 95° F ambient temperatures). Storage temperature: –20° to 45° C (–4° to 113° F).
MacBook works best at 10° to 35° C (50° to 95° F). Storage temperature: –20° to 45° C (–4° to 113° F ambient temperatures).
Charging your device when it’s inside certain styles of cases may generate excess heat, which can affect battery capacity. If you notice that your device gets hot when you charge it, take it out of its case first. For Apple Watch Edition models, make sure the cover o