Anker E4 13000 mAh external battery pack – Review

Anker E4 13000 mAh external battery pack   Review

I’ve dabbled with external battery packs before, you know the sort. An unbranded 3000 mAh battery that refuses to work after a few weeks.

It was after my wife and her friends went to a festival down south a few weeks ago and all of their phones died at some point during the day, that I got thinking.

What would have been ideal for them would have been a large capacity battery with several USB ports and it should be easy to use. A quick poke around on Amazon and I had ordered this rather splendid looking Anker battery pack.

Key Features

  • Monster capacity (13000mAh) delivers 6+ charges to most smartphones or 80% of a full cycle to iPad 3 / 4. In terms of power, this is the biggest, baddest battery in the Anker mobile line.
  • Super-fast charge output (5V / 3A) though dual USB ports (5V / 2A and 5V / 1A) allow for simultaneous charging of your iPad, iPhone, Android, and more at high speed.
  • Premium lithium-ion battery ensures quality, supplying 500+ recharge cycles over a lifetime. Use a 1.5A adapter or over for fast charging.
  • Smooth, ivory varnish allows you to power up in style, while 4 status LEDs keep you informed of remaining capacity. Built-in flashlight for dark or low-light environments.
  • Package includes: 1 Anker® Astro E4 External Battery, 4 connective adapters for smartphones, 1 USB cable, instruction manual.

Good Points

  • Huge battery capacity
  • Two USB ports
  • High power 2A USB port for tablet charging
  • Flashlight

Bad Points

  • Heavy
  • Slow to charge main unit back to full capacity
  • It turns itself on in bags or pockets


Anker have took a huge chunk of battery pack and tried their hardest to make it look nice, initially you’d think it was a chunky external hard drive or something.

The front and the back of the battery pack are made of white smooth gloss plastic, which is a little slippy, there is also a silver band running around the edge, this silver band has the two USB outputs and also the Micro USB charging socket.

The only other parts of interest are the power gauge and the big button on the top. oh and how could I forget the flashlight that lives between the two USB outlets.

In use

At 13000 mAh the battery pack can charge a selection of phones and tablets several times, over the last few weeks I’ve got into the habit of not actually charging my phones using a mains outlet and just charging using the Anker battery pack at my desk, being able to charge two phones at once is really useful.

You basically wire the device that needs charging into the battery pack and hit the button on the top, it starts to charge it and the lights on the top indicate how much charge is left. The lights will also indicate how much charge there is whilst you charge the battery pack as well.

The handy thing about the Anker battery pack is that the two USB outlets are rated differently, one at 2A for large items like tablets and the other at 1A for smaller devices like phones. In the box you get a selection of charging heads to use with the supplied cable. So most devices will be chargeable using either their own cable or the supplied one.Anker E4 13000 mAh external battery pack   Review

Anker E4 13000 mAh external battery pack   Review

As regards charging times etc, the Anker did seem slightly slower to charge devices than a normal wall outlet of the same rating and it took an age to charge the unit itself. However I was impressed with its ability to charge almost anything anywhere. Being able to charge my phones on the fly proved to be quite handy, I found myself using the Anker instead of trying to find a plug socket.


Overall the Anker E4 Astro was an interesting piece of kit. Having such a large charge stored in the battery pack means that you cab get three or four charges out of it before it gives up, which means that you’ll not lose charge on your two day festival/camping holiday/breakdown in the woods.

I bought this one from Amazon for £29.99 which I thought was a decent price for such a nice package.

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  • MadMeddler

    Bought one of these myself (though in piano black) a couple of weeks ago. First time I managed to use it in anger was this last weekend and it was awesome. Charged my phone, my friends phone and my camera whilst in the Olympic stadium and still had about 50% free for charging my Nexus 7 in the way home (while reading a book). All in all very happy with this purchase for the price.

  • weirdstuff

    4 charges before needing to be charged itself? Get-in! I feel an impending purchase in my future…

  • Martin

    I have the smaller 5400 unit (Reviewed by Ronnie here, thanks :) ) for my phone and it is great, what I like about the smaller one is it has a built in 2 LED torch which is handy for the odd walk back from the train station in the dark :)

  • Kevin

    Nice review,

    i saw the external battery the first time on and the second time on you Website.

    Thanks for the review and i buy one battery! ^^

  • Allen Clark

    Nice Review. I am going to buy one of this. But i am still can not decide to buy this one or RAVPower KnightRider 14000. Any Suggestion ?

    • Andrew Rodden

      I personally have a RAVPower KinghtRider. It works like a charm. And I don’t have problem with fingerprint since it is with a matt finish. I can’t tell which is better since I don’t have any experience with the Anker. But it seems the KnightRider is superior with a higher capacity and little bit lower price.