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Anker® 2nd Gen Astro2 9000mAh High Speed 3A Portable External Battery Charger with PowerIQ™ Technology for Smartphones, Tablets and More (Black)

4.6 out of 5 stars 1,211 customer reviews
| 142 answered questions

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  • The Anker Advantage: Join the 10 million+ powered by Amazon's #1 charging brand.
  • Exclusive PowerIQ Technology: Detects your device to deliver its fastest possible charge speed up to 3 amps per port or through two ports.
  • Ultra-High Capacity: Charges the iPad mini one and a half times, the Galaxy S5 two and a half times, the iPhone 6 almost four times and other smartphones multiple times. Recharges in 7-8 hours with 1.2 amp adapter (not included) and the included Micr
  • Superior Quality: Premium LG cells, cutting-edge circuitry and a sturdy drop-tested exterior ensure durability and safety. Shake to start a charge or check the power level.
  • What You Get: Anker 2nd Generation Astro2 Portable Charger External Battery Power Bank, Micro USB cable, travel pouch, welcome guide, our fan-favorite 18-month warranty and friendly customer service.

High-Quality External Battery Packs from AmazonBasics
Safely charge your smartphone or tablet with a portable battery pack from AmazonBasics with power overload protection. Shop now.

Product Features

  • Size (LWH): 2.56 inches, 4.17 inches, 0.98 inches
  • Weight: 8.8 ounces
  See more technical details

Product Description

[Product Name] Anker Astro2 second generation [Capacity] 9000mAh [Input voltage] DC 5V / 1A [Input port] microUSB [Out] The maximum 5V/3A (total 3A) [Size] 106x64x25mm [Package Contents] ANKER Astro2 second generation mobile battery body, MicroUSB cable, mesh carrying pouch, Japanese instruction manual In order to use the comfortable and safe, certified cables genuine cable of your device, to third-party organization: The cable supplied with this product or (example: MFI authentication), in order to use optimally it is recommended that before you use it.

Product Information

Product Dimensions 2.6 x 4.2 x 1 inches
Item Weight 8.8 ounces
Shipping Weight 8.8 ounces
ASIN B00DMWV3EU
Item model number AK-79AN7903S-BA
Customer Reviews
4.6 out of 5 stars 1,211 customer reviews

4.6 out of 5 stars
Best Sellers Rank #61,399 in Cell Phones & Accessories (See Top 100 in Cell Phones & Accessories)
#446 in Computers & Accessories > Tablet Accessories > Chargers & Adapters
#1,223 in Cell Phones & Accessories > Cell Phone Accessories > Batteries & Battery Packs > Portable Power Banks
#1,247 in Electronics > Portable Audio & Video > MP3 & MP4 Players & Accessories > MP3 & MP4 Player Accessories > Batteries & Battery Packs

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By JJCEO #1 HALL OF FAMETOP 10 REVIEWER on August 29, 2013
Length: 6:00 Mins
This review is on Anker Astro 2 second generation 9000 mAh black battery pack. This battery pack is a real powerhouse of energy and in my test results it performed extremely well in supplying a charging current to an iPad 2 and an iPhone 4. It is also designed to allow you to charge two items at the same time. I also tested the battery pack charging and iPad 3 and an iPhone 4 simultaneously. It comes with an Apple 30 pin connector and other accessories that you need to make it more useful. You may need to use your original charging cables for some devices so take them with you if you need them.

It is a great power resource to keep your USB recharged devices operating on those long work or school days or while you are traveling. This battery pack is a powerful source of power and many people like me are power users of their smart phones and tablets and need a battery like this. If you are constantly using your phone or tablet then you know that they will run out of power sometime during the day or evening. If you are not near an AC wall outlet with your charger or in your car with a charger what can you do? It is especially important to have some way to recharge if you are traveling in a plane, in the middle of a school classroom or on a bus or train. In addition many of the newer tablets are real power hungry devices and it takes a lot to recharge them.

Here is a powerful battery pack with two USB ports. It can charge your tablet devices or charge your smart phone and if you want it can do both of them simultaneously. I charged two iPhones at the same time in my testing. One Smart USB output port is rated at 5 VDC and 2.4 Amps and the other one is rated at 5 VDC and 3 Amps. It uses Lithium-Ion battery technology and carries a 9000 mAh capacity.
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I have been using my iPhone as a GPS with the Gaia GPS app while I have been in the backcountry, and decided that an external battery was a must for extended trips. I also decided that I wanted a backup battery for our iPad when we travel with our kids. I had a hard time deciding what mAh rating I needed, but wound up deciding to go with 9,000 because it will charge my iPhone 4s six times (the 4s has a 1,432 mAh battery) and my gen 1 iPad nearly twice (5,400 mAh).

After looking at all sorts of batteries and reviews on Amazon I decided to call Anker's customer service number to try to get a recommendation. I wasn't expecting much, but was very pleasantly surprised when I reached a U.S. based customer service representative who was extremely helpful. She discussed the pros and cons of the various models I was considering, and wound up recommending the Astro2. About a week after my purchase I even received a follow-up e-mail from Anker letting me know that they are always available to provide support which just capped off a level of customer service that is rare today.

The battery itself appears to be very well made. It has a nice rubberized coating and comes in a padded mesh bag. The included micro USB cable and 30 pin adapter work well with my iPhone 4s, but those with Lightning devices will have to use their own cable. It is a about the diameter of a pack of cards but a little thicker, and has no buttons. The led charge indicator is not visible unless you shake the battery to wake it up, and is in the form of a segmented ring. All in all I like the design very much.

I would recommend this to someone with needs similar to mine, or would recommend other Anker models to those with different external battery needs based upon the quality of the products as well as customer support.
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other than any slight movement of the charger turns it on its a fine product, but to travel with or just sitting on the table its fine, UNLESS YOU MOVE IT, THEN IT AUTOMATICALLY TURNS IT`S SELF ON, not sure why this feature was put into a charger, but i would rather have the option of actually pressing the ON button vs. any slight movement to turn it on...

update, customer service has contacted me and has exchanged via a free new Anker without the sensor motion feature, After their concern on their part in making me happy i was quite surprised at how much they went out of their way to make things right, now if more companies cared enough to actually reach out to their customers like Anker has done,shopping would be so much better, having a company that actually cares means they have a customer for life, NICE JOB CUSTOMER SUPPORT!!!
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If you work or live in a storm prone area in the United States and lose power for an extended amount of time you know that having access to portable power is imperative. This little guy puts out power for just about any electronic device you can throw at it. We have many devices from different brands and all charge up without issue. Simple and easy to use. Instructions on how to us are cut and dry. Its small form factor is great to put in a "bug out bag" or just to keep in the desk for those unexpected power outages. The fact that you can charge two devices at once is plus. A very solid built product at a price that is good on the pocket book.
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I keep this portable backup in my backpack. It is great when you're out or traveling and need to charge a phone or tablet. I have a couple of Bluetooth headphone sets and it charges them as well. I'm retired and go to a local coffee shop for a couple of hours most mornings. If I have forgotten to charge my phone, it's a convenient way to do it there. I don't have to find the one or two tables near a power outlet.

Many hotels still don't have convenient plugins by the bedside table. Rather than running an extension chord or leaving my phone or tablet where I can't reach them, I just plug them into my Anker external battery overnight. Then I charge the Anker while I'm out during the day. It will easily charge both my Nook HD+ tablet and iPhone with enough power left for maybe a couple more phone charges or one more tablet charge, though I usually recharge it. My wife has an older Anker charger for her phone and it also works great. I just bought our daughter the 12000mA version. I remember walking around Chicago as a tourist last summer with my wife's Anker in my pocket charging my cell phone. There was certainly a bulge to my pocket, but I could stay in contact with my wife and daughter when we were apart. And, after all, I was a tourist.

I would recommend this for anyone with a cell phone or tablet. They're great.
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