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Old April 11th, 2013, 09:51 PM   #9 (permalink)
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I do see your point, but I believe we are talking about two different things. External battery is a your emergency charger when you are running out of juice and nowhere near the nearest power outlet. It's also universal and can be used for your phone, or another phone or tablet. Another great function is to have it plugged it while you are watching a movie.

Spare battery is just to continue using your phone as is without waiting to charge it up.
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