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Anker 2nd Gen Astro Pro2 20000mAh Quad-Port External Battery with PowerIQ™ Technology

Anker 2nd Gen Astro Pro2 20000mAh Quad-Port External Battery with PowerIQ™ Technology


Product Description

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

Compatibility maximized.

Not all charging ports are created equal. Standard ports only communicate effectively with particular devices, like Apple OR Android, often limiting their recharge rate. But with PowerIQ™ technology, each port intelligently identifies your device to speak its unique charging language. So plug in any brand or model and enjoy compatibility that doesn’t limit your charging 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.

• Please use your device’s original cable or a third-party certified one (such as MFi).
• Compatible with all Apple and Android smartphones, tablets (including the Nexus 7) and other USB-charged devices. The iPod nano, iPod Classic, HP TouchPad, LG G2, Asus tablets and some GPS and Bluetooth devices are not supported.

Customer FAQ

Q1.  Can I use USB cables other 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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Latest Post

Wh rating of Astro Pro2
Hi,  I'm trying to work out the total wh rating of your Anker® 2nd Gen Astro Pro2 20000mAh Multi-Voltage battery As I wish to take it as hand baggage on a plane.   So is it 20Ah * 5v = 100Wh (OK)  or 20Ah * 12v = 240Wh (not Ok on a flight)  If you could let me know the Wh rating, or alternatively let me know the voltage of the Li-ion battery prior to conversion to 5/9/12v I will be able to work out myself.Best Andy 
Replies(1) Collapse Report as spam Sep 23, 2014 at 5:24 AM
I wouldn't worry about all the technical stuff, besides I have no idea what all that means, but I do have this unit and i've used it on four flights with no issues. I always carry on. I left it at the top of my bag, put it through x-ray and off I went noquestions asked. I also carry an external HD with it's own wifi to play my vids on my iphone and that also went through no problem. BTW the last time I flew was this past August 2014. Hope my ramblings help you.  
Reply Report as spam Sep 23, 2014 at 12:33 PM
Power for LED strip
I am trying to power 3 12v led strips, one changes colors. All are 12v. Two uses 4.5a and one uses 4.8Aa. This worked with all them for awhile but now it makes a high pitch sound when turned on powering them and the lights turn off seconds after turning on. Is it too much power?
Replies(0) Collapse Report as spam Sep 22, 2014 at 11:04 PM
Doesn't work anymore
 My unit doesn't seem to work anymore. Everytime I connect to the wall charger it only reads zero even if I've connected for more than 5 hours already. It's no longer charging and it's only been around 5 months since I bought it. I'm in the Philippines right now and I was hoping to use it for my trips to remote areas with no electricity... Please help
Replies(3) Collapse Report as spam Sep 20, 2014 at 7:53 AM
Andy Faulkner
Does the charger have an output ie. have you checked the fuse
Reply Report as spam Sep 20, 2014 at 12:11 PM

If you've tried different outlets and possibly even a different AC charger and you're still having problems then it could indicate a fault.

We won't be able to process a replacement if you're in a different country to where it was originally shipped but if you get in touch with our customer service guys at then they'll do everything they can to help.
Reply Report as spam Sep 21, 2014 at 9:30 PM
Son-j Laruscain
thank you. i will be in the US this week so this shoud be doable. i have high expectations of your great after sales customer service. :)
Reply Report as spam Sep 22, 2014 at 9:32 AM
lg g3 nexus 4/5 compatiblity
Does the Anker 2nd Gen Astro Pro2 20000mAh compatible with lg g3 and nexus 4/5 devices ?thanks,ariel
Replies(2) Collapse Report as spam Sep 18, 2014 at 9:23 AM

Absolutely, it'll work great with all of those.
Reply Report as spam Sep 18, 2014 at 10:30 PM
Ariel Edri
Reply Report as spam Sep 21, 2014 at 2:26 AM
Driving two device
Can I drive to device using 5V USB output sourcing 3A and 12 output sourcing 7A at the same time. Ali.
Replies(1) Collapse Report as spam Sep 16, 2014 at 7:00 PM

The max output of the USB ports is 3A and the max output of the DC port as 12V is 1.5A.
Reply Report as spam Sep 16, 2014 at 9:00 PM
My family lost the charging transformer while overseas, how do I get a replacement? Or can you tell me what plug size and voltage so I can try picing up one at my local RS?
Replies(1) Collapse Report as spam Sep 15, 2014 at 1:41 PM

The plug you need should output 12V/2A of DC current, if you can find one at RS then it'll work fine but our customer service guys will also be able to help if you give them a shout at
Reply Report as spam Sep 15, 2014 at 8:30 PM
Panasonic Cameras (GH4)
Hey, is this badboy able to charge a Panasonic Camera, the GH4 in this example? I'm about to order a few Astros but I want to make sure it's working. I heard there are DC couplers out there. Would that power the camera directly? Ideally I'd love to just charge the batteries. So when I'm shooting, the Anker sits in my backpack and gets the reinforcements ready. Is that somehow possible? Thanks a lot guys! 
Replies(1) Collapse Report as spam Sep 14, 2014 at 1:32 PM

As long as the power requirement for the couplers/camer is between 9-12V/0.05-1.5A then it'll work just fine!

Do give our customer service guys a shout at if you need any further help.
Reply Report as spam Sep 14, 2014 at 9:00 PM
9v and 12v output amps
I have a problem. I'm using the 9v supply to power two voice amps and the battery (times out) after 30-60 seconds. I assume I'm not pulling enough current to keep the supply alive. How much current (amps) do I need to keep 9v port alive? Same question for the 12v also?  Anthony
Replies(1) Collapse Report as spam Sep 13, 2014 at 6:02 PM

You'll need to be drawing more than 0.05A or the Astro will not recognise a charging requirement.
Reply Report as spam Sep 14, 2014 at 9:00 PM
External Power for Zoom H6
Can you please recommend the best possible external power source for my Zoom H6 digital multi track recorder? I am looking for maximum recording time in the field with a safe and compatible source.  Thank you.
Replies(1) Collapse Report as spam Sep 13, 2014 at 8:07 AM

This depends on the Zoom's power input requirements.

If you check the Zoom's original charging source for a figure in V/A and then give it to our customer service guys at then they'll be able to make a recommendation for you.
Reply Report as spam Sep 14, 2014 at 9:00 PM
not charging beyond 82%
Hi their my astro pro 2 2nd gen 20000mha will not charge beyond 82%. I have had it since march 2014. It was used for 2 weeks solid in florida in may and its been used about 10 times after that but i have always charged it after use. Could you help
Replies(2) Collapse Report as spam Sep 10, 2014 at 1:29 AM

Please give it a shot with another wall outlet and another AC charger if you have one available.

If you're still having problems then give our customer service guys a shout at and let them know, they'll be able to help you further.
Reply Report as spam Sep 10, 2014 at 2:00 AM
Andy Faulkner
I have had success by connecting something to the power bank and draining it so that it has no stored power and then charging, I believe this reset the batterys memory.
Reply Report as spam Sep 20, 2014 at 12:14 PM
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