Update: Expired
While I'm partial to external battery packs, there's a lot to be said for the convenience and portability of battery cases. This iPhone 6 model from Alpatronix has great reviews, enough juice for a full charge, and most importantly, a slim profile. It's a steal $31 price tag today. [Alpatronix MFi-Certified iPhone 6 Battery Case, $31 with code BX140OFF]
Don't forget to head over to Kinja Deals for the rest of the best deals from around the web.
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