Shop4Tech.com offers this 2200mAh External Battery Case for Apple iPhone 4 in Black for $22.95. Coupon code “SAVE17″ cuts it to $19.05. With free shipping, that’s $21 under yesterday’s mention of a 1700mAh battery case and the lowest total price we’ve seen for any iPhone 4 battery case. This iPhone 4 case with built-in battery ships with a micro USB charging cord. Coupon expires November 4.
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