You don't need to have one of those super hefty extended battery phones to burn through juice with wanton disregard for the future. All you need is a big honking external battery, and we found just the thing on sale today. The Anker Astro E4 is a 13,000mAh rechargeable cell that is usually only $44. That's a good deal, but for the next few days, it's down to $36.99.
The Anker Astro E4 weighs under 11oz and can charge most smartphones 5-6 times without needing to juice up itself.