Smartphones are convenient, but keeping them charged is not. Charging cables get tangled easily and, despite being lightweight and portable, aren't all that useful on the go. External battery packs can provide a ton of juice when away from a power outlet, but if you forget to keep them charged, you might as well leave them at home. The JUMP Kickstarter project alleviates this issue by combining the two. Now your smartphone cable can double as your external backup battery.

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