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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

9901 Bluetooth speaker

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

- 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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Latest Post

auto off or overcharge?
When I charge the battery of the 2nd Gen Astro Pro2, after it reaches full capacity, will the device automatically stop charging? Or will it keep charging? If it's the latter, must I worry about overcharging? Thanks for the response.
Replies(0) Collapse Report as spam Jul 31, 2014 at 3:18 PM
I have a question about the Anker 2nd Gen Astro Pro2 20000mAh Quad-Port External Battery with PowerIQ™ Technology. For the Input and Multi-Voltage ports, what size of connector tip fits in the ports? 
Replies(2) Collapse Report as spam Jul 31, 2014 at 12:33 AM
Andy Faulkner
The output are a standard USB connection whilst the input port is for the supplied as adapter 
Reply Report as spam Jul 31, 2014 at 1:43 AM

The input port fits 5.5*2.5mm and the DC output accepts 5.5*2.1mm connectors.
Reply Report as spam Jul 31, 2014 at 4:30 AM
Please direct me to where I can purchase -- 4.3 x 1.6mm to 5.5 x 2.5mm multi-voltage cable.  Thank you for your assistance.
Replies(1) Collapse Report as spam Jul 27, 2014 at 2:39 PM

We can supply the cables to previous customers so if you have already made an order then get in touch with our customer service guys at and let them know what you need, they'll be able to help further.
Reply Report as spam Jul 28, 2014 at 2:30 AM
How many Wh?
Hello,I need a power bank and I like the specifications of this product but before I buy it I'd like to know how much energy is in the power bank in Wh...I think that this parameter is more important than the total charge that it contains and that you specify.It's strange that a so important parameter is specified in nowhere.Thanks a lot.
Replies(5) Collapse Report as spam Jul 27, 2014 at 2:31 PM
Justin Rohr
Total Charge is equal to the specified power capacity, so 20,000mAh = 20,000mWh in this case. It's just how mobile batteries are presented.i.e.  A typical phone battery is 2300-3000 mAh's...
Reply Report as spam Jul 27, 2014 at 7:54 PM

It depends at what voltage you're using the Pro2.

If you're outputting 5V then it'll have 100,000Wh.
Reply Report as spam Jul 28, 2014 at 2:30 AM
Marco Bazzotti
Quote From Justin Rohr:No, mAh indicates the charge while mWh the energy... they are quite different.
Reply Report as spam Jul 28, 2014 at 7:29 AM
Marco Bazzotti
Quote From ANKER Team:From the Anker team i expected a more intelligent answer. Please give me the right answer otherwise I think I'll buy a different power bank. Thanks a lot
Reply Report as spam Jul 28, 2014 at 7:37 AM
Marco Bazzotti
To anyone who can be interested...I write an email to the customer service and finally they told me that the battery has 74 Wh of energy as I expected. So internal voltage is 3,7 V.
Reply Report as spam Jul 30, 2014 at 9:07 AM
Charging the Anker
Does this unit have a car charging adapter so I can charge this a cigeratte lighter plug.
Replies(1) Collapse Report as spam Jul 26, 2014 at 5:56 PM

Unfortunately, we don't manufacture a dedicated charger for this device.

If you want to charge it in your car then you'll need a charger that can output 12V/2A DC.
Reply Report as spam Jul 28, 2014 at 1:30 AM


Test Astro Pro 2 par Damien
Voici mon troisième test d'un produit Anker que j'ai reçu gracieusement de la marque afin d'en faire l'essai. Je les en remercie. L'emballageOn ne change pas les bonnes habitudes chez Anker puisque l'Astro Pro2 se présente dans un emballage brun avec une surcouche sous la forme d'un carton blanc mettant en valeur le produit. Cet emballage permet de tout suite savoir ce que nous avons sous les yeux, puisqu'outre la référence Astro Pro 2, on apprend que cette batterie offre pas moins de 20000 mah (oui, c'est bien 20000 !!), l'une des plus grosses batteries externes que j'ai pu apercevoir sur le marché. Bien entendu et comme toujours avec la marque, on retrouve les infos utiles tel que le site internet, les horaires d'ouverture de la hotline pour les USA (et seulement pour eux :/ ). Ouvrons la bête et découvrons la suite...L'Anker Astro Pro 2 et ses accessoiresUne fois ouvert la surchouche blanche en carton retirée, on ouvre l'emballage principal pour y découvrir l'Astro Pro 2. Une belle pièce d'aluminium noir dont la beauté n'est pas pour me déplaire. Premier choc, la prise en main et le poids ! Un bon demi kilo à la pesée. J'avoue que cela change de ma batterie externe achetée à Taïwan et qui doit à peine faire dans les 100 grammes. La taille aussi est en rapport avec la puissance de la batterie puisque on se retrouve avec un objet de la taille d'une liseuse. C'est grand il faut l'avouer.Passé le choc de la découverte du poids, je fais le tour du propriétaire et je dois avouer que je suis séduit. Qualité de fabrication excellente, tout est bien ajusté et l'aluminium fait son effet. L'objet est classe et design. On retrouve sur la façade, un petit écran LCD qui indique l'état de charge de la batterie, le voltage et s'il est en recharge. Pour résumer, juste les informations essentielles.Sur la tranche haute du produit, on retrouve les 3 ports USB ainsi que les ports de charge de la batterie. Concernant les ports USB, j'avoue avoir rencontré un peu de mal à connecter le câble USB de mon Ipad Retina sur l'un des trois port. En revanche, le câble USB de mon smartphone (Oppo Find 5) et de ma seconde tablette (Nexus 7) se sont connecté du premier coup. Bref, erreur de manipulation, mauvais ajustement, en soi rien de bien grave et les 3 ports fonctionnent à merveille.Niveau accessoires, nous avons une petite housse fort sympathique, un câble USB pour charger la batterie et un adaptateur secteur également. Bref, un ensemble complet pour s'adapter à toutes les situations. Petit plus, l'adaptateur secteur possède une partie qui s'enlève afin de retirer les connecteurs d'alimentation. Idéal pour le rangement et, pourquoi pas, pour adapter une prise au pays souhaité. Une option peut-être envisageable chez Anker??Revenons maintenant à la fonction première de cet Astro Pro 2, la charge. Avec son système IQ intégré, Anker annonce pouvoir offrir une charge USB à pleine vitesse. De mon côté, j'avoue avoir été surpris de la rapidité de charge. Selon mes constations, la vitesse de charge est bien supérieure à un port USB d'ordinateur sans pour autant atteindre la vitesse d'une charge sur secteur. Résumons:Charge secteur > Charge Astro Pro 2 > Charge USB ordinateur > Charge avec mon ancienne batterie externe Taïwanaise.En soi, c'est une sacrée avancée puisque avec cette batterie externe, je fais mieux que ce que je faisais avant avec mon humble batterie externe Taïwanaise et encore mieux qu'avec une charge sur mon PC.En charge (et par ces fortes chaleurs en France), la batterie ne chauffe quasiment pas avec mon smartphone et mon Ipad branché. C'est encore un bon point et l'aluminium ne doit pas y être innocent.Pour terminer, avec 20000mah, que puis je faire? Pour faire simple, c'est deux charges entières de mon Ipad Retina, soit avec mon utilisation, 8 jours d'autonomie (charge de départ 2 recharges) ou carrément 6.5 charges de mon smartphone ce qui le propulse à une autonomie supérieure à une semaine avec une utilisation intensive. C'est une véritable source d'autonomie pour nos objets connectés, fort consommateur d'électricité lors des déplacements.Pour terminer, parlons tarif puisque cet Astro Pro 2 est disponible pour 65€ TTC Un tarif qui me semble convenable pour une telle batterie externe. Encore un excellent produit Anker que je ne peux que recommander.
Replies(1) Collapse Report as spam Jul 26, 2014 at 1:14 PM

Veuillez recevoir nos sincères remerciements pour avoir pris le temps de poster un commentaire!
Reply Report as spam Jul 28, 2014 at 1:30 AM
New Anker 2nd Gen Astro Pro2 20000mAh
I ordered the unit NEW from Amazon and when it arrived it would not power on due to the battery being completely drained. The interior of the box also looked like it was previously opened as well so I felt the need to return it fearing I was sent a USED product. I really want this unit so should I try re-purchasing it? Is it ok for the battery to come depleted and the interior packaging be torn in some places?
Replies(2) Collapse Report as spam Jul 25, 2014 at 12:44 PM

Sorry to hear that you received a battery in this condition!

We only ever sell brand new products, never refurbished or 2nd hand. We cannot vouch for how much charge the battery will have on arrival but any kind of internal damage or signs of use is unacceptable.

Please reorder in confidence, we take our quality control incredibly seriously. If you do need anything else then give our customer service guys a shout at
Reply Report as spam Jul 27, 2014 at 11:00 PM
Quote From ANKER Team: Thank you for your response. I will reorder. 
Reply Report as spam Jul 28, 2014 at 7:57 AM
Vaio duo 13 10.5 v
Hi,I want to know which product I can use to give extra charge to kt sony vaio duo 13 ultrabook?it has dc in socket.and hast unremovalbe battery. Thanks,Behzad Amoozgar
Replies(2) Collapse Report as spam Jul 25, 2014 at 12:07 PM

The max output of the 2nd Gen Pro2 is 12V/1.5A so you'll need to make sure that is enough to power your laptop by comparing it to the output of your laptop's original charger.

The 1st Gen Pro2 can output 19V/3A so that may be enough to charge the laptop if the 2nd gen is unable to.
Reply Report as spam Jul 27, 2014 at 11:00 PM
behzad amoozgar
 Quote From ANKER Team:Hi,Thanks for your reply,the only problem is the 10.v adaptor, I already bought astro 2 , first generation 200000 mahmp , tried it with one of the socket that could barely fit inside. It started charging my sony but because of 12 v of anker I did not continue due to any burned out that could happen. Will it be safe to use 12 v to charge my ultrabook?Thanks,Behzad Amoozgar
Reply Report as spam Jul 29, 2014 at 11:40 AM
Charging camera battery
I have a camera with an 'on board' battery, which is charged from the mains supply using a 7.4 volt charger. Could I safely use the 9v output of the Anker 2nd Gen Astro Pro2 20000mAh to charge this camera battery? Would charging at 9v cause any potential problems with the camera power supply?
Replies(1) Collapse Report as spam Jul 24, 2014 at 8:39 AM

No, the extra voltage wouldn't cause any damage, it should work well.
Reply Report as spam Jul 24, 2014 at 10:30 PM
Asus Ultrabook S56C
Would this charge the Asus Ultrabook S56C?  The AC adaptor says its' input is AS100-240V ~ 50-60Hz 1.5A and output is 19V - 3.42A.Thank you!
Replies(1) Collapse Report as spam Jul 24, 2014 at 1:30 AM

The max output of the 2nd Gen Pro2 is 12V/1.5A so it is fairly underpowered compared to the Asus's native charger. This means it probably wouldn't work.
Reply Report as spam Jul 24, 2014 at 4:30 AM
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