Groupon offers the uNu DX external protective battery case for iPhone 5/5s in a variety of colors for $35.99 shipped using coupon code LABOR10 during checkout. That’s $55 off the original list price, nearly $25 better than Amazon, and the best price we’ve seen on this highly rated battery case by $9.
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.