The iPhone Air's headline feature — its extraordinarily thin chassis — comes with a finite battery budget, and heavy days can outrun it. Apple's answer is the iPhone Air MagSafe Battery (MGPG4AM/A), an attachable battery pack designed specifically for the iPhone Air's dimensions and MagSafe magnet array. Usage is deliberately simple: snap the pack onto the back of the phone and it begins charging; pull it off when you no longer need it. There are no cables dangling between phone and pack, no case to install, and alignment is automatic thanks to MagSafe. Because it is shaped for the iPhone Air specifically, the pack sits flush with the device rather than overhanging like generic magnetic banks. For business users, the pack pairs naturally with the ways an iPhone Air gets drained fastest: personal-hotspot duty when laptop connectivity fails over to cellular, all-day camera documentation on job sites, navigation-heavy travel days and conference days spent off the charger. Slip the pack on during the heavy stretch and pocket it afterward. As a genuine Apple accessory it integrates with iOS battery status displays, so combined charge state is visible at a glance. Shipping weight is approximately 0.40 lb. If you manage iPhone Air devices for a mobile team, a MagSafe Battery per traveler is cheaper insurance than midday charger hunts. MPN MGPG4AM/A, UPC 195950669688.