Incipio OffGRID Express
The OffGRID Express iPhone 6 battery case is an affordable option that delivers a large, 3,000mAh battery and a nice design to charge up and protect your iPhone 6.
In our test we found, "That larger capacity charged my iPhone 6 from about 3% to 100% in just under two hours, and it still had about 15% to 20% of battery juice left."
"In the end, $80 for the OffGRID Express is a great price," writes Craig Lloyd in our review. He isn't a fan of the installation process, but most users will only do this once.
The OffGRID Express is $56 at Amazon.