‘Wish you could have faster cordless charging for your iPhone than the measly 5W you get with Apple’s MagSafe Battery Pack ... ‘In order to get 7.5W charging on the Go, you’ll need to update your MagSafe Battery Pack to firmware version 2.7 ... Besides the battery pack, Apple also offers a $35 Wired MagSafe Charger, various MagSafe-enabled silicone iPhone cases starting at $39, and a range of $59 leather wallets that Snap onto the back of your iPhone using the MagSafe Technology.