I’ve been using a PowerRocks MagicStick 2800 mAh with my iPhone. It keeps it nicely topped up while on the go. The supplied cable is used to charge the battery; you supply your own phone cable (e.g., Lightning cable for recent iPhone models).
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This extended battery is small enough to easily fit in a purse, briefcase, backpack...even in the palm of your hand. This lightweight but powerful battery is perfect for work, vacation and everyday on-the-go. It has a modern slim, sleek, and stylish design. Its compact design makes it convenient to carry in your pocket or purse. You could even leave it plugged in to your phone. Micro USB cable and velvet bag are included.