iWalk’s new Duo 3000 ($25) is a smaller, less expensive, lower capacity version of the company’s Extreme Trio 10,000 battery. Like that battery, Duo 3000 also includes a built-in Lightning cable and micro-USB cable. A short, separate micro-USB cable is also included for recharging the battery — a micro-USB port can be found on top of the battery, along with a power button. The front of Duo 3000 has a small blue status light, and the 3000 mAh battery charges iOS devices and can be recharged at standard 1A speeds.
Duo 3000 is a light, pocketable battery pack. Based on its capacity, it should be able to fully recharge an iPhone 6s, while taking up a minimal amount of space. We can’t speak to the pack’s durability, and we must note that if the Lightning cable were damaged, the pack would become useless to any iOS device which wasn’t using a micro-USB battery case. But to find a nice battery with a built-in Lightning cable at this capacity is a steal.