The power's out. This road trip will never end. Camping, again? Fine.
Whatever the reason, sometimes you just need extra power when there's no outlet in sight. In those instances, you're going to want the biggest, fattest external battery pack you can find. And if you have to share it, or you have multiple devices, then you're going to want something with more than one USB port.
If you head over to StackSocial and happen to live in the US, you can currently get a Limefuel LP200X battery pack with a whopping 20,000mAh of juice.