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.

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The Anker Astro E4 weighs under 11oz and can charge most smartphones 5-6 times without needing to juice up itself. It also has dual USB ports so it can power two devices simultaneously. To sweeten the deal further, the Anker Astro has an LED flashlight, because why not?

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To get the deal, just plug in the coupon code BDDL6ZN9 at checkout and you should have $36.99 to pay with free standard shipping. That's a few bucks cheaper than the last time this battery came up for sale. The reviews are positive, so check it out.