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Get this iCanonic Elite iPhone 5 Battery Case for $34.99 plus free shipping at Groupon Goods. This was the lowest price we found by $10. This case has a built-in 2000mAh battery to give extra life to the iPhone, up to 10 hours or talk time. Plus, this case has received many positive reviews from Amazon buyers. It's available in white or black. Sales tax is charged in most states.