Packing a wall wart, battery backup, and cables for your and anyone else's phones and tablets is one option. None of this is particularly appealing to anyone who does not get a thrill out of fulfilling a Boy-Scout-like desire to plan for every possible phone/tablet contingency. As a backup, you can tote around a bulky portable battery. To plug them in elsewhere, you need to carry around the right kind of cable, and an AC adapter (or "wall wart"), which might not work with all devices (particularly newer iPads) because of amperage differences in charging current. Smartphones need power, often when you are away from computers or outlets or car chargers. One new product solves a few of them at once, which is a very nice thing. Our extremely convenient smartphones create a few inconveniences, as a byproduct of just versatile they are in such a small package.
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