You can use a power bank of up to 10,000mAh to charge your smartphone and accessories on the go. With a 10,000mAh power bank, you can fully charge most smartphones up to 2 times. If you get a 5000mAh one, you can give your phone enough power for about 1 full charge. These power banks are small and lightweight, so you can easily take it with you. Don't want to use a cable? Choose a wireless MagSafe power bank that you can attach to your phone.