MagSafe Battery for iPhone Air is thin, light and fits comfortably in your pocket. It extends battery life by up to 65%, giving more energy than any other iPhone. When attached to a charged phone, the system automatically optimises charging for the whole day, and when you need a quick boost it provides up to 12 W wireless charging on the go. For even faster charging, MagSafe Battery can be connected to a 20 W or higher adapter together with the phone.