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  • Anker® 2nd Gen Astro Pro2 20000mAh 4-Port Aluminum Portable Charger  External Battery Power Bank with 9V/12V Multi-Voltage Port and PowerIQTM Technology for iPad Air mini, iPhone 6 5s 5c 5; Galaxy S5 S4, Tab 2, Note, Nexus, MOTO X, G, LG Optimus, HTC One, PS Vita and More
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Anker® 2nd Gen Astro Pro2 20000mAh 4-Port Aluminum Portable Charger External Battery Power Bank with 9V/12V Multi-Voltage Port and PowerIQTM Technology for iPad Air mini, iPhone 6 5s 5c 5; Galaxy S5 S4, Tab 2, Note, Nexus, MOTO X, G, LG Optimus, HTC One, PS Vita and More

by Anker
| 264 answered questions

Price: $159.99
Sale: $79.99 & FREE Shipping. Details
You Save: $80.00 (50%)
In Stock.
Black
  • The Anker® Advantage: Join the 6 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, plus additional 9/12V port. Max speed of 4.5 amps through four ports.
  • Incredible Capacity: Charges the iPhone 5s ten times, the Galaxy S5 almost six times, the iPad Air almost twice and other tablets multiple times.
  • Ultra Efficient: Energy efficiency 10% above the previous generation and many other brands maximizes usable power. Recharges in just 4-5 hours using the included 100-240 volt adapter.
  • What You Get: Anker® 2nd Gen Astro Pro2 Portable Charger External Battery Power Bank, 100-240 volt adapter, Micro USB cable, 4.3 x 1.6mm to 5.5 x 2.5mm multi-voltage cable, travel pouch, welcome guide, our fan-favorite 18-month warranty and friendly customer service.
2 new from $79.99 2 used from $59.00

Frequently Bought Together

Anker® 2nd Gen Astro Pro2 20000mAh 4-Port Aluminum Portable Charger  External Battery Power Bank with 9V/12V Multi-Voltage Port and PowerIQTM Technology for iPad Air mini, iPhone 6 5s 5c 5; Galaxy S5 S4, Tab 2, Note, Nexus, MOTO X, G, LG Optimus, HTC One, PS Vita and More + Anker® 40W 5-Port High Speed Desktop USB Charger with PowerIQ Technology for iPhone, iPad Air 2, Samsung Galaxy, Nexus, HTC, Nokia and More (Black) + Anker® 24W 2-Port Rapid USB Car Charger with PowerIQ Technology for iPhone, iPad Air 2, Samsung Galaxy, Nexus, HTC, Motorola, Nokia and More (Black)
Price for all three: $115.97

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Color: Black
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This item: Anker® 2nd Gen Astro Pro2 20000mAh 4-Port Aluminum Portable Charger External Battery Power Bank with 9V/12V Multi-Voltage Port and PowerIQTM Technology for iPad Air mini, iPhone 6 5s 5c 5; Galaxy S5 S4, Tab 2, Note, Nexus, MOTO X, G, LG Optimus, HTC One, PS Vita and More
Customer Rating (953) (1569) (3222) (1334)
Price $ 79.99 $ 45.99 $ 29.99 $ 39.99
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By AnkerDirect AnkerDirect AnkerDirect AnkerDirect
Color Black Black Black 13000mAh Black 16000mAh
Dimensions 0.65 inches x 4.45 inches x 6.61 inches 1.02 inches x 4.37 inches x 3.27 inches 0.91 inches x 5.91 inches x 2.44 inches 0.91 inches x 5.91 inches x 2.44 inches
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Product Details

Color: Black
  • Product Dimensions: 4.4 x 6.6 x 0.6 inches ; 1.1 pounds
  • Shipping Weight: 2 pounds (View shipping rates and policies)
  • ASIN: B005NGLTZQ
  • Item model number: AK-79AN7906-BA
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (953 customer reviews)
  • Amazon Best Sellers Rank: #3,263 in Cell Phones & Accessories (See Top 100 in Cell Phones & Accessories)
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Product Description

Color: Black

ANKER: Amazon's #1 Charging Brand

• The highest average review rating of any charging brand.
• One in three chargers sold on Amazon is from us.
• Join the 6 million+ satisfied customers powered by Anker.

2nd Generation Astro Pro2 Portable Charger External Battery Power Bank
Power, speed, compatibility and portability - all maximized at last.

PowerIQ Detects your device. Delivers the fastest charge.
Exclusive to Anker, PowerIQ amp-adjustment technology intelligently identifies your device to deliver its fastest possible charge.

Incredible Capacity
Power to keep you going, and going...and going. Add 1000% more charge to a phone, 100-300% to a tablet, or even back-up for your camcorder.

Ultra-High Output
With an industry-high 4.5 amp output through four ports, including a 9/12 volt multi-voltage port, charge several gadgets all at full speed.

Slim & Sleek
The size of a small notepad, this aluminium battery is sturdy yet portable. Its LCD tells you the power level down to the percentile.

World Famous Warranty
At Anker, we believe in our products. That's why we back them all with an 18-month warranty and provide friendly, easy-to-reach support.

For Optimal Use:
• Use the included cable, your original cable or a third-party certified one (such as MFi).
• Compatible with most most 5/9/12 volt powered devices, Apple and Android smartphones, tablets (including the Nexus 7) and other USB-charged devices except for the iPod nano, iPod Classic, HP TouchPad, LG G2, Asus tablets and some GPS and Bluetooth devices.

Customer Reviews

4.6 out of 5 stars

Most Helpful Customer Reviews

272 of 286 people found the following review helpful By JJCEO #1 HALL OF FAMETOP 10 REVIEWER on May 19, 2013
Color Name: Black
Length: 8:13 Mins
This battery pack is one of the most powerful rechargeable battery packs that I have ever tested. It is also matches the highest quality design and construction that I have seen in any battery pack. I was so impressed that I put together a video of the unit and the test results for your review.

The construction of this battery pack is simply beautiful. The exterior shell is brushed black anodized aluminum that looks fantastic. The battery is the size of a 7 inch tablet and it weighs in at 1 pound 1 and 1/2 ounces. It is assembled with machine screws and the overall construction is the best I have seen. The battery pack has three USB smart output ports that output 5 VDC at variable current to meet the charging requirements of the device you have plugged into it. It is called a Smart Port or an IQ port. It uses a chip to help select the proper current to allow the maximum safe charging current for the fastest device charging. It can also output 12 VDC at 1.5 amps and 9 VDC at 2 amps to charge many other higher voltage devices. You press the ON button and hold it for 2 seconds to select the 9 or 12 volt output voltage for specialty charging so make sure that you set it to match the needs of your device. This is important.

This battery pack has enough power to charge an iPad 3 fully and in reality it could charge it 1.33 times according to my tests. I was able to charge my electronic devices for over 13.5 hours on a single charge of the battery pack which is amazing. During the testing the temperature of the battery pack never even exceeded ambient room temperature. I used the USB port to charge my devices during this testing.
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40 of 42 people found the following review helpful By LP Texas on September 27, 2013
Color Name: Black Verified Purchase
Great product. I had a difficult time finding an external battery that didn't cause a red x appears over the battery icon on the Galaxy Note 10.1. With other external batteries I was able to resolve the issue with an adaptor, but it's great not having to worry about one extra peripheral adaptor. Anker's USB output S, (which stands for Samsung), with circuitry designed for the Samsung Galaxy Tab worked perfectly! Hope this helps other Note 10.1 users!
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27 of 29 people found the following review helpful By Stanley V on July 20, 2013
Color Name: Black Verified Purchase
Anker is obsessed with customer satisfaction, and they are clearly achieving it with products that are priced very competitively and customer service that is prompt, thorough, and efficient. This is my 7th Anker battery pack purchase, though I have given four away as gifts. All units work great, but each unit has its specific "specialties" so read the description and specifications carefully to ensure you get the unit that is best for you. This is the first unit I've purchased that is recharged with its own AC power cord that comes with the unit. (All others are recharged with a common micro USB cable that is included, though you need your own USB power SOURE such as a computer USB port or an AC wall USB adapter. The wall adapters are available on Amazon for around $10.) THIS unit MUST be recharged from AC power which reduces its flexibility slightly, but the upside is that it recharges itself about 2.5 - 3.0 times faster than the other units. A 30 minute charge of this unit provides sufficient power to completely recharge my Blackberry Z10, so if you have limited time to recharge equipment, this can be extremely handy. It takes about 4-5 hours to fully recharge a depleted unit. As advertised, it charges all my 5 volt devices including my phones, Zune, electronic reading magnifier, Bluetooth devices, and other similar gadgets. Since it can charge 9 and 12 volt devices it also powers/recharges my portable DVD player (adding seven hours of playback time) along with just about all my electronic devices that can be powered with a 12 volt power cord designed for use while in a vehicle, including lights, games, radios, GPS units, etc. (This is beyond the stated design intent of the unit, but it works fine so long as you ensure the proper voltage is used and no more than 2 amps are required.Read more ›
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14 of 14 people found the following review helpful By HomeTheaterLover on March 27, 2014
Color Name: Black Verified Purchase
This is for the Anker 2nd Gen Astro Pro2 20000mAh battery pack.

There are a few different products in the reviews for this product so you have to read carefully.

This is designed very well, beautiful finish and easy to operate.

This can achieve 80%+ efficiency when you are charging a device that charges at 5v 1000ma. Better efficiency can be achieved when you are charging devices that draw 2000ma. However, if you are charging a device that only charges at 500ma, the battery pack does not last nearly as long due to several factors. It's effective charge potential can be as low as 2,500ma if you are running a 50ma LED light for example. (50 hour run time). The reason for this is common in the marketplace for these style batteries due to the 3.7v to 5v/12v circuits. It is rated at 3.7v @ 20,000 mAh or 74 watt hours. You can subtract 1 watt (270 ma) per hour the unit is on and it will be completely depleted if on for 74 hours with load. (Auto-shutoff prevents this). My LG phone draws about 30ma and peaks to 75ma every 15-20 seconds so the unit does not turn off after the phone is done charging. If my phone has 98% battery and put it on charge with this battery when I go to bed, it will use 7-10% of the battery in 8 hours. If I left the phone unplugged, it would still be on 98% in the morning. I bought this one for the flexibility of using 12v for charging the unit and misc items I have like a 12v rechargeable lantern. The Charging circuit uses about 270ma + (charge mA * (Output Voltage / 3.7). I.E. If you are charging a 500ma device, it draws 945ma (675ma + 270ma) off the battery. When charging 500ma devices, You will get about 20 hours of charging before battery is dead. This example is far below the 80% efficiency it claims.
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