For iphone 6 users...check this out if you are looking for a battery case. I cant take advantage of this deal cause i have the Plus.
http://www.groupon.com/deals/gg-urge-basics-armorlite-battery-case-for-iphone-6
http://www.groupon.com/deals/gg-urge-basics-armorlite-battery-case-for-iphone-6