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Anker 2nd Gen Astro Pro2 20000mAh Quad-Port External Battery

Anker 2nd Gen Astro Pro2 20000mAh Quad-Port External Battery

Charger- 40W 5-port desktop charger

Product Description

Tablet & phone compatibility? Universal max-speed charging? Power-packed & portable? The reinvented Astro Pro2 has it all.

PowerIQ™: Full speed charging. Every device, every time.

Not all USB charging ports are created equal. Standard ports only charge Apple OR Android devices at full speed. Our solution? Smart ports, powered by PowerIQ™ technology, intelligently identify your device and speak the language it needs for full speed charging. Coupled with an industry-leading 4.5 Amp output, charge multiple devices all at full speed.

Uber powerful.

20000mAh of power keep you and your gear going, and going - and going. Add 1000% more battery life to an iPhone, 600% to your large-capacity phone (like a Galaxy S4), or 130-300% to your tablet (depending on its battery capacity) - all away from an outlet. What's more, the added energy efficiency gives you 10% more usable power than the previous generation and many standard alternatives.

Brilliant display.

Interacting with the all-new aluminum-cased beauty couldn't be easier. The LCD simplifies everything - displaying the remaining power (with precision down to the percent), output, input and voltage selection.

For optimal use

- To ensure complete safety and best performance, we strongly recommend using your device’s original cable, a third-party certified cable (such as MFI) or our included cable.
- Compatible with all Apple and Android smartphones, tablets and other USB-charged devices. The iPod nano, Asus tablets (not include the Nexus 7), the LG G2 and some GPS and Bluetooth devices are not supported.

Popular Compatible Models

Apple: iPhone 5S, 5C, 5, 4S, 4, 3GS / iPad, iPad 2, iPad 3, iPad 4, iPad Air / iPad mini 2 / iPad mini / iPod (Apple adapters not included)
HTC: One Max, One, One X, S, V / Sensation, Sensation XE XL / EVO 4G / Radar 4G / Inspire 4G / Vivid 4G / Wildfire S / ThunderBolt / Incredible 2 S / Rezound / Desire X, C, V, HD, S, Z
Samsung: Galaxy S4 / S4 mini / Galaxy S3 / Galaxy Note 3 / Galaxy Note 2 / Galaxy S2 I9100 / Galaxy S I9000 / Verizon Galaxy S3 I535 / AT&T Galaxy S3 I747 / Sprint Galaxy S3 L710 / T-Mobile Galaxy S3 T999 / T-Mobile Galaxy S2 T989 / AT&T Galaxy S2 I777 / AT&T Galaxy S2 Skyrocket SGH-I727 / Galaxy Nexus / Focus S / Infuse (Samsung 30-pin adapter not included)
Motorola: X Phone, Droid Razr, Bionic / Atrix 2 / Triumph
LG: Nexus 4, Optimus 4X, 2X, V, S, T, 3D, 7
Nokia: Lumia 1020 920 820 900 710 800 / N8 / N9
Others: Blackberry Z10 Torch Curve 9900 9360 9320 / Sony Ericsson Xperia Arc S, Sony Xperia Z,X10 / PSP / Nook Color / MP3 MP4 MP5 / GoPro / Amazon Kindle, Kindle Fire,Nexus 7

Customer FAQ

Q1.  Can I use USB cables othan than those provided with my Anker external battery?
To ensure complete safety and best performance, we strongly recommend using your device’s original cable, a third-party certified cable (such as MFI) or our included cable.
Q2.  Does it work with the new iPhone 5s, 5c?
Yes. But the Apple connector is not included. Please use your device's original cable.
Q3.  Anker external batteries' efficiency.
ALL external batteries lose power due to voltage conversion and circuit resistance.

Approximately 20% of Astro 2nd Generation external battery’s total capacity is consumed, including power lost from circuit heat and voltage conversion within the external battery (approximately 6%) and the charging cable and your device (approximately 14%). This efficiency rate is 15% higher than the industry average of 35%.

Older Astro batteries have lose approximately 30%.

According to industrial standards, all external batteries are labeled based on their raw cells capacity not efficiency. Like others, we are following this standard.
Q4.  How long will the battery lasts while not in use?
Generally, most of our external batteries' static power consumption is lower than 100uA, which will take between 3.5 and 20 years to drain the battery completely.

However, the chemicals within the li-ion battery will gradually become less active over prolonged periods without use. Most will die in 2 years of inactivity.

To extend your battery's life:
1. Charge and recharge it at least once every 3-4 months.
2. Do not over-charge or over-discharge it. It is best to keep it charged between 5%-95%.
Q5.  Can Anker external batteries be used for international travel?
Yes. Be sure the USB adapter you bring with is compatible with the voltage of the country you will be traveling to. An adapter's voltage input is usually printed on the adapter.
Q6.  Can external batteries be taken on board airplanes?
Yes, all Anker external batteries can legally and safely be taken on board airplanes. Here are the relevant requirements:

Quoted from Federal transportation security rules (Effective January 1, 2008):
Lithium ion batteries (a.k.a.: rechargeable lithium, lithium polymer, LIPO, secondary lithium).
-Passengers may carry consumer-sized lithium ion batteries [no more than 8 grams of equivalent lithium content or 100 watt hours (wh) per battery]. This size covers AA, AAA, 9-volt, cell phone, PDA, camera, camcorder, Gameboy, and standard laptop computer batteries.
-Passengers can also bring two (2) larger lithium ion batteries (more than 8 grams, up to 25 grams of equivalent lithium content per battery) in their carry-on. This size covers larger extended-life laptop batteries. Most consumer lithium ion batteries are below this size.

Anker's largest external battery is currently the Anker Pro 20000mAh (74 wh) which is lower than the above 100 wh limit.
Q7.  What can I do if I lose the provided accessories?
Please check to see if you have extras or contact us via email at for help.

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Anker Customer Support and the Anker user community will do their best to quickly answer your question.



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Latest Post

Will it power a Microsoft Surface Pro

I see it rated at 4.5 AMps, and the std charger for a surface pro has 3.6 amps, however I saw elsewhere someone complaining it was not powerfull enough to run their surface.

Replies(2) Collapse Report as spam Apr 6, 2014 at 11:28 AM
Tech X-Ray

Doesn't have the right adapter to charge a surface pro

Reply Report as spam Apr 6, 2014 at 11:30 AM

I know that, however the adapers are redily available, so the question is whether this thing has enough guts to power it.  It looks like the previous genreration was a better unit?  It boasted 4A at 12 volts.  So the question then is will this run the surface Pro.   I don't care if it can charge it up, just extending the run time to maybe 9 hours or more.  Is the older unit still available?

Reply Report as spam Apr 7, 2014 at 2:54 PM


Need this on

Hi! Will it be available soon at


Replies(2) Collapse Report as spam Apr 4, 2014 at 8:47 PM
Tech X-Ray

Hopefully. Pester Anker on social media to bring it to your country

Reply Report as spam Apr 4, 2014 at 11:55 PM

They are tough to find, even in on If you see it, buy it fast.

Reply Report as spam Apr 5, 2014 at 5:25 PM
Max power per port?

Can you specify the max power per port?

I recently bought your 40w ac charger, which charges my iPad Air at 2.4amps (12w) and your anker astro3, white version, that charges only at 2.1amp(10w) per port.. Which is it for this battery? All 3 products use Power IQ, but obviously a different version...

Replies(2) Collapse Report as spam Apr 3, 2014 at 9:47 AM
Tech X-Ray

I believe it should be 2.4 A

Reply Report as spam Apr 3, 2014 at 12:17 PM
The Pro2 can provide 4.5A between its 3 USB ports. If you only have one device plugged in then it is capable of routing that all through a single port. If you have two devices plugged in, it'll do 2.25A per occupied port and 3 devices would be 1.5A.
Reply Report as spam Apr 8, 2014 at 5:01 AM
About use of Astro Pro 2

Can you inform me if I can use Astro Pro 2 20000 mAh as a normal power supply device? I mean, can I plug the device to the wall all day and use it as a power supply in that way? Will this use waste out the batteries of Astro Pro very soon?

Thank you

Replies(3) Collapse Report as spam Mar 31, 2014 at 11:37 AM
Carlos Duarte

Quote From HammerNexus: Thank you for your answer. I am asking this because of travelling. It would be nice for me to travel with only one device that can charge and backup my cell, tablet, bluetoth wireless kbd, handfree phones, etc. instead of carrying at least two devices (multicharger + backup battery).

I do not why engineers can not do a simple circuitry to cut off battery charging process when batteries are full and re-direct power to devices actually pluged to Astro Pro.

Reply Report as spam Apr 2, 2014 at 11:47 AM

You can, but it isn't terribly good for the batteries to be in a state of constant charge. You'll wear out your Astro Pro 2 faster using it that way rather than charge/discharge cycles.

Reply Report as spam Mar 31, 2014 at 1:23 PM

You can but I see no reason why you would want to do that?

You can get a wall adapter for cheaper

Yes, continous plugged in usage will degrade the battery faster than regular usage like any other device 

Reply Report as spam Mar 31, 2014 at 7:07 PM
Anker 2nd Gen Astro Pro2 20000mAh

1.) Can this be cgarged via a usb wall charger or does it have to be plugged into a wall outlet?

2.) Can itself be charging while charging other devices?

Replies(4) Collapse Report as spam Mar 29, 2014 at 9:42 PM

Yes to both questions. It comes with a USB cable, for optimum performance it is recommended to use the cable that came with your device.

Reply Report as spam Mar 29, 2014 at 11:48 PM

Um..... No to the first, but yes for the second.

It's a 12v 2A input with a provided power adapter. There is no USB power input. 

I have the 1st gen and I charge mine and charge phones at the same time often with no issues.

Reply Report as spam Mar 30, 2014 at 10:45 AM

Quote From gherardini: I agree with Ghrardini. TechToyWizard is spewing misinformation

It has to be charged from the wall outlet as the input required is: Input 12V / 2A

For the second question:

It can be charged while being used to charge other devices

Reply Report as spam Mar 30, 2014 at 7:08 PM

spewing??? that's a little strong... ;-)

Reply Report as spam Mar 31, 2014 at 1:24 PM
Voltage for Anker 2nd Gen Astro Pro2


I live in Canada but would like to use the Anker 2nd Gen Astro Pro2 abroad.

Will it accept 220V/240V input to charge? I have an adapter but not sure if I would also need to buy a transformer to charge this product.


Dave Juurlink

Replies(3) Collapse Report as spam Mar 28, 2014 at 5:38 AM

Hi I dont think this is an issue - I can't believe Anker would actually sell it into Canada if there were any problems.  And if they were that silly, their 18 month warranty and "PLATINUM" levels of customer service would have you sorted in no time!!!

Reply Report as spam Mar 28, 2014 at 9:38 AM

The power adapter is 110/220v

Reply Report as spam Mar 28, 2014 at 11:29 AM

It'll accept 220 

Reply Report as spam Mar 28, 2014 at 1:23 PM
Finally in stock

Been waiting for this to come back in stock:

Finally here again! 

Replies(2) Collapse Report as spam Mar 25, 2014 at 3:24 PM

April 8th. I like it, mainly b/c of the black color and LED power display. Not totally excited they took out all the laptop support. But it'll charge smart phones for a couple weeks.

Reply Report as spam Mar 28, 2014 at 11:31 AM

Quote From gherardini: I don't think they fully took out laptop support. It can possible still charge netbooks and smaller laptops like the older one

Reply Report as spam Mar 28, 2014 at 1:24 PM
5 Volt 1.5 Amp

Will this device cause any issues when used on a digital picture frame requiring 5 Volt 1.5 Amp?

Replies(4) Collapse Report as spam Mar 24, 2014 at 9:47 AM

What's the power interface of the frame? The DC output of the battery is USB: 4.5A (max); DC: 9V / 2A or 12V / 1.5A, which has a higher voltage than the frame allows, so yes. But I don't think your picture fram allows a DC current input, does it?

Reply Report as spam Mar 24, 2014 at 10:22 AM


Current doesn't matter.

As long as it's 5V, the frame will pull what it needs

Reply Report as spam Mar 24, 2014 at 1:49 PM

SWEEET!  Thanks for the reply guys.  I think it'll work perfect.  I mounted a digital picture frame into my shadow box to display my race medals, and mounting this batter to the back of the box will allow the system to awesome.  At 20K mAh, I can get some serious run time.

Reply Report as spam Mar 24, 2014 at 2:27 PM

Quote From daves0811: Definitely. Lots of run time. Don't forget that it's rechargeable so it'll last you forever!

Reply Report as spam Mar 24, 2014 at 6:20 PM
Chargin via USB port in my car?

Can this device be charged via USB port in my car?

Replies(2) Collapse Report as spam Mar 21, 2014 at 10:56 AM

Does the USB port in your car output 12V / 2A?

If so, yes

Reply Report as spam Mar 23, 2014 at 12:44 AM

Use a qualit charger, not those cheap toys

Reply Report as spam Mar 23, 2014 at 1:31 AM
I want one!

God, I would love to take this thing out as a test drive!  Something like this would be perfect for an HP Chromebook 11.

Replies(4) Collapse Report as spam Mar 18, 2014 at 6:12 PM
Nexus Hammerhead
Yeah I want one too! It's so popular and often out of stock
Reply Report as spam Mar 18, 2014 at 7:44 PM
I have the 1st Gen, big difference, I think, is that the 1st gen has a much better laptop compatibility than the 2nd gen. The 2nd gen, however, has that cool black color and the power display. I might want a 2nd one.
Reply Report as spam Mar 18, 2014 at 9:20 PM
its got the specs but I have to say I think my 2nd gen Astro3 (12000mAh) looks way nicer. Having only the pics of the Pro to go off, it looks a little too much like a HDD enclosure. One of the things that impressed me so much with the Astro3 is the quality of the shell and finish.
Reply Report as spam Mar 19, 2014 at 10:41 AM
David Hocutt
gherardini is correct - this battery has limited laptop compatibility, but does work for tablet/netbook hybrids like the ASUS T100 that recharge via a micro USB port. It is also great for power hungry tablets like the iPad Air. The digital power meter is also a plus.
Reply Report as spam Mar 19, 2014 at 7:08 AM
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