Maxboost via Amazon offers its Maxboost Vivid 3,100mAh Protective Battery Case for iPhone 6 / 6S in Vermillion Red for $37.99. Coupon code "2CG3PX7V" cuts that to $10.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.22.) That's $89 off list and the lowest total price we've seen for any 3,100mAh battery case. It provides an extra 18 hours of talk time, and includes a microUSB cable.
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