The uNu DX cases have a 2300mAh built-in battery (“equals additional 10 hours talk time”), an integrated charging switch and battery level LED indicators. Wirecutter says its one of the best iPhone 5 battery cases available, second only to the Lenmar Meridian (currently $44.99) due to a slightly slower charge and a usually more expensive price tag.
This case comes with a one-year “worry-free” warranty from uNu and has received a 4/5 star rating from over 880 Amazon customers.
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