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?

2013-10-16 13_25_31-Place Your Order - Amazon.com Checkout

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.


Ryan Whitwam
Ryan is a tech/science writer, skeptic, lover of all things electronic, and Android fan. In his spare time he reads golden-age sci-fi and sleeps, but rarely at the same time. His wife tolerates him as few would.

He's the author of a sci-fi novel called The Crooked City, which is available on Amazon and Google Play.

  • yihtang

    Not applicable for Canada :(

    • mobilemann

      if it makes you feel better, anker stuff @ normal prices is great. I got it's bigger brother a week or two ago (15k mAh) for $49

  • howardbamber

    Or the UK

  • http://404err0r.com/ Henry Park

    Yay!!! and it will arrive just in time for me to participate in #13Magnus in Seattle xD

  • itsanaddiction

    I'm betting the majority of people visiting this page are Ingress players...

    • Bill Blandford


    • SickoPsycho

      damn right. I have one but I only get like 2 full charges out of it which means when i'm playing ingress I get about another 2 hours of screen on time while it's plugged in =)

    • http://twitter.com/brianrose Brian Rose


  • http://friskychatter.com/ _jsw_

    I can vouch for this battery - awesome little bugger, and that LED flashlight is reasonably bright but diffuse. Why is that good? Well, if the power ever goes out and you've got kids, this will last as a nightlight for many nights in a row if need be. Otherwise? It's not all that useful. ;-)

    • mobilemann

      so your saying you don't actually use it for charging, more for the tiny flashlight? ?

  • thas ★

    They don't ship to Canada. :(

  • Di Lu

    Hmm, I have no use for this until January. Would I be better off buying in December due to Lithium battery aging?

    p.s I assume you can carry this on flights without problems?

    • covert

      This battery would be well below the 8 grams Equivalent Lithium Content (ELC)

  • Bud Lutz

    Is this something worthy of throwing in a drawer / car for those times when the power goes out? Or will I find it a year later and the battery is dead?

    • Jellyface86

      I got the same question

  • Neal Horowitz

    How do you define "most smartphones" in the context of being charged 5-6 times? You'd be lucky to get four full charges of a One out of this, much less higher-capacity phones like GS4/G2/Note--maybe you could get six charges into an iPhone, but even the One mini would be hard-pressed to get a fifth full charge. I mean, it's a good price for its capacity and I've generally had positive experiences with other Anker products, but you should be realistic about the actual amount of power you get out of external batteries.

    • http://404err0r.com/ Henry Park

      I guess its like storage... In real life they only get so much, but they just rounded off for marketing and other shit

      • nealho

        It's not really the same thing, unless your point is just "marketing is misleading," in which case, yeah. The issue with storage is that when they say a drive has "1 TB" on the box, they mean one trillion bytes. However, when you ask Windows (or Android, or any modern OS really) what the storage capacity, they use binary prefixes, so if Windows say 1 kB, that's actually 1024 bytes, and 1TB is 2^40 or about 1099 billion bytes. So a 1 TB hard drive shows up as about 930GB.

        The battery thing is more about charging efficiency--they (probably) aren't lying to you about the capacity of the battery. There is some stored energy in the external battery and you want to transfer that to the phone's battery. You can't just move the electrons (sadly that's not how it works :P); you have to run 5V DC through the phone's charging port. The transfer incurs a number of efficiency hits--the exact values vary by battery and phone and charge curve, but the usual estimate for external batteries is that you can squeeze around 70% of their maximum capacity into your phone.

  • angel_spain

    I wish this deals regarding powerbanks were available in Europe. :( Go for them, it's an awesome deal.

  • Kelvin Chung

    to buy now or wait till black friday... hmmmm

  • Steve Williamson

    got one of these, used it for festival in September. Took my nexus 4 through from Thursday-Monday and also charged up a 3 other smart phones once each as well.. totally worth it!

    Also useful when on long car journey where you won't have time to recharge your phone when you complete the journey. Will spend most the time in your draw but worth it for the couple times a year when you might need it.

    hell, if your going camping, buy one to share between everyone!.

  • Nikie Lima

    I think everything need one like this. I have a RavPower 14000mAh battery charger, what about u?