There’s a power shortage in your pocket. While our mobile devices offer convenience, they still have a significant flaw: The rechargeable battery never seems to last long enough. Whether you’re on a business trip or family vacation, the only way to make sure it can keep up with you is an external backup battery.
When you’re buying one, it’s important to think about mAh (milliamp hour), an indication of how much juice a battery holds. To fully recharge an iPhone 6, you’ll need 1,810 mAh, while the Samsung Galaxy S6 needs 2,600 mAh. If you’re planning to charge anything other than a phone, like a tablet, you’ll need a battery capable of 2.1 amps. With that in mind, here are 12 great options that’ll give you serious power when you need it most.