Another Anker External Battery

The new Anker Astro alongside a (small) iPhone 4S.
The new Anker Astro alongside a (small) iPhone 4S.

Almost exactly a month ago we wrote about the new high-capacity Anker Astro 3 External Battery.

This unit holds 12 Amp hours of power – enough to recharge a typical smart phone almost ten times, or enough to recharge a large-sized tablet once plus a smart phone and an MP3 player too, and with a bit left over for something else.

That’s a huge amount of stored power.  Yes, there are definitely times when you’ll want all this power – if you’re on a long journey somewhere with many hours on flights and no onboard power, you might find you need to recharge your tablet if you’re watching movies on it, or recharge your eBook reader if you’re reading books, and probably recharge your MP3 player too.

But what about for when you’re ‘just’ traveling around your local area for a long day, and find your phone is getting perilously close to zero?  Most modern smart phones struggle to get through a long hard day of usage without a top up, and it adds an unpleasant edge to your daily activities to be anxiously watching your battery charge state dropping and dropping still further, causing you to start to ration your use of the device for fear of running out of battery life.

Sure, by all means get one of the Astro 3 units.  At just under $25 on Amazon , they are excellent value for what they are.  But some might consider them overkill if all you need is perhaps a single recharge of your phone and maybe an emergency partial top-up of some other portable device as well.

Recognizing this part of the market, Anker have just released a smaller, lighter, and less expensive product, the Anker Astro (rather than the Astro 3), and priced at $20 on Amazon .  Here’s a table of the differences between the two units

Astro Astro 3
Height 3.7″ 4.4″
Width 1.8″ 3.3″
Depth 1.0″ 1.0″
Weight 8.8 oz 10.6 oz
Amp Hour capacity    6.0 Amp hours 12.0 Amp hours
Number of Ports One Three
Max charge rate 2.0 Amps 4.0 Amps
Price $20 $25


The new Astro has an interesting advance in technology.  Whereas the Astro 3 has three ports to charge from, with one being optimized for fast charging of iOS devices and two being optimized for fast charging of Android devices, the Astro has managed to cram all the electronics for intelligent fast charging of both types of device into the single port.

On the other hand, its max charge rate is 2.0 Amps rather than 2.4 Amps (per port and 4 Amps total over the three ports) with the Astro 3.  But that merely reflects the different design and purpose of the Astro.  It is a smaller more compact unit (half the volume of the Astro 3) designed as more of an emergency top up unit rather than an ultra-extender such as the Astro 3.

If we were buying a unit for ourselves, we’d get the Astro 3.  Twice as much capacity doesn’t only mean twice as much stored power, it also means you can tap into the power more regularly and not need to be always topping it up again.  So it is a more generally convenient and multi-purpose device, but it is also more expensive and bulkier.

The Astro unit is perhaps ideal as a stocking stuffer for people who you feel deserve a $20 gift, but not a $25 gift.  🙂


Anker have a wide range of external batteries, including three latest generation external batteries, with either one, two or three ports.  Most people will choose between the single port Astro and its 6 Amp hour capacity, or the Astro 3 and its 12 Amp hour capacity (the Astro 2 has a 9 Ah capacity).

Both units distinguish themselves from competitors by their clean design, intelligent high current charging circuits, good value, and 18 month warranties.  Our preference is for the Astro 3 , but the Astro is an excellent unit if you’re keen to minimize the space/weight you devote to electronics in your carry-on, or if you’re, ahem, gift-giving on a slightly less generous budget.

8 thoughts on “Another Anker External Battery”

    1. David Rowell – Seattle, WA, USA – New Zealander now living in the United States.

      I think I’d still buy an Astro 3 over the RavPower unit you linked to.

      The Anker has three ports instead of two, it supports 4A of charging instead of 3A, it has an almost zero self discharge rate, and an 18 month warranty. That’s worth a few dollars, in my opinion.

      There’s always something cheaper out there, but cheaper isn’t invariably the same as better. 🙂

  1. Pingback: Weekly Roundup, Friday 5 December - The Travel Insider

  2. Pingback: Anker Astro3 12,000 mAh External Battery - The Travel Insider

  3. Pingback: The Best Way to Read eBooks - Summer 2015 - The Travel Insider

  4. Pingback: Amazon's Amazing New $50 Tablet - The Travel Insider

  5. Pingback: Amazon's New Fire Tablets - Small, Medium, and Large : Does Size Matter? - The Travel Insider

Leave a ReplyCancel reply

Free Weekly Emailed Newsletter

Usually weekly, since 2001, we publish a roundup of travel and travel related technology developments, and often a feature article too.

You’ll stay up to date with the latest and greatest (and cautioned about the worst) developments.  You’ll get information to help you choose and become a better informed traveler and consumer, how to best use new technologies, and at times, will learn of things that might entertain, amuse, annoy or even outrage you.

We’re very politically incorrect and love to point out the unrebutted hypocrisies and unfairnesses out there.

This is all entirely free (but you’re welcome to voluntarily contribute!), and should you wish to, easy to cancel.

We’re not about to spam you any which way and as you can see, we don’t ask for any information except your email address and how often you want to receive our newsletters.

Newsletter Signup - Welcome!

Thanks for choosing to receive our newsletters.  We hope you’ll enjoy them and become a long-term reader, and maybe on occasion, add comments and thoughts of your own to the newsletters and articles we publish.

We’ll send you a confirmation email some time in the next few days to confirm your email address, and when you reply to that, you’ll then be on the list.

All the very best for now, and welcome to the growing “Travel Insider family”.


Exit mobile version