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Anker 2nd Gen Astro3 12000mAh Power Bank External Battery Charger for Smartphones, Tablets, and USB devices (1 Smart Port & 2 Universal Ports)

  • 1 Smart Charging port, PowerIQ Technology, intelligently identify each connected device
  • A “Shake” Starts a charge or displays the remaining power level

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Anker 2nd Gen. Astro3 - 12,000mAh External Battery

The all-new 2nd generation Anker Astro3 recasts the possibilities of mobile power. Keep multiple gadgets powered up better than ever, whatever your adventure.


Anker Astro Battery

Packed with Power

We figure, the more power, the better. Packed with 12,000mAh of juice, and featuring an energy efficiency rate 10% higher than the previous generation, the new Astro3 charges the iPhone six times and large-capacity phones like the Galaxy S4 almost four times. Keep multiple devices going yourself, and still have juice left to share.

Anker Astro Battery

The Faster the Better

Waiting was never fun, was it? That's why we created the new Astro3 with a smart port that detects USB pin signals to identify your device - whether Apple, Android, or even the Samsung Galaxy Tab - and charge it at full speed. With two additional ports, no need to wait in line either.

Anker Astro Battery

Double Take

Chic and minimalistic, the new Astro3 may feel reserved at first. But, a friendly "shake" reveals its warm inner light to display the power level or begin your charge. Generous, cool, and delightfully intuitive, the new Astro3 is perfect for your next adventure, or just the daily grind.

Anker Astro Battery

For Optimal Use

- For simultaneous, max-speed charging of your Astro and other devices, check out Anker's new line of 18W / 3.6A car and home adapters.
- Compatible with all Apple and Android smartphones, tablets and other USB charged devices with a 5V charge input. The iPod nano and some GPS and Bluetooth devices are not supported.

LIAN LI Computer Case

Learn more about the Anker 79AN7904-BA

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Customer Reviews of the Anker 79AN7904-BA

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  • Brian W.
  • 8/11/2014 9:28:00 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year

5 out of 5 eggsDon't settle for anything less!

Pros: Very high capacity. High-efficiency charging circuitry maximizes runtime. Can handle high loads, 4+ amps. Clean and simple design with ten-step LED power indicator. Very competitively priced.

Cons: None.

Other Thoughts: This is the absolute best USB power bank you can get for the money. I have seen lots of other brands of USB chargers, both cheap no-names and name-brand products, but nothing matches the performance and value for money of this Anker power bank. I've seen competing products cost more than twice as much with yet fail to match the capacity or performance of this product.

This power bank can run my 2012 Nexus 7 for at least three full days before needing to be recharged. Efficiency is outstanding, evidenced by very cool operation even under load. Charging can take a long time, about nine hours from empty from a 2-amp USB AC adapter, but this is to be expected given the capacity of the unit.

If you want the very best USB power bank, get Anker. Nothing else compares.

Did you find this review helpful? Yes No

  • Anonymous
  • 6/4/2014 8:24:30 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsHandy backup

Pros: Capacity - Get multiple charges out of it for a Galaxy S3 and last gen Kindle Fire HD. The "4-6 charges for a smart phone" estimate seems fairly accurate, as taking my S3 from a 25-30% charge to a full charge only lowers the Astro3s power meter by 1/8th to 1/4th

Size - maybe slightly larger than a deck of playing cards? Not a problem if you're already carrying a larger smartphone or tablet

Solid construction

Rapid device charging - My S3 charges just as fast if not faster on the "Smart" port than the standard wall plug

Accurate charge meter - better than the standard 3-light displays

Several USB ports

Cons: Included USB cable is kind of short.

No charging adapter - For a $100 sticker price, I'd expect one to be included, especially since if you try charging this thing off a standard computer USB port, it'll probably take the better part of a week.

The following should be expected from the rated capacity:

Weight - even though size-wise it fits nicely in a pocket, you may not want to. I'm one of those guys that walks around in cargo pants with everything a nerd needs in the pockets, but even this is pushing it.

Recharge time - At first I thought I got a defective unit, as I left it plugged in to a cheapo wall wart for close to two hours and the battery level didn't change. I had to go looking for a higher current charger and leave it plugged in overnight. Not the type of backup you can plug in for 10 minutes before running out the door.

Other Thoughts: So far it's been a handy back up. Yes, there are a few cons, but they are what I expected so I can't really knock off any eggs.

1 out of 1 people found this review helpful. Did you? Yes No

  • Yun W.
  • 6/4/2014 5:41:50 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsAs advertised

Pros: Works as advertised

Cons: None

Did you find this review helpful? Yes No

  • Spence B.
  • 5/19/2014 2:49:30 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsAnker 2nd Gen Astro3

Pros: Charges wifes Samsung s4 phone 3 times without recharging. Pretty small but of course heavy.

Cons: Doesn't include wall charger, can only charge from computer if you don't supply your own wall unit to plug into usb cable.

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  • Jason C.
  • 5/16/2014 8:57:13 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsWorks Great

Pros: Works great, exactly as described. Charges fast, lasts forever.

Cons: None

Other Thoughts: Just buy one already!

Did you find this review helpful? Yes No

  • SUNG K.
  • 5/14/2014 12:14:09 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggslike expected..

Pros: Fast re-charging/charging speed.
Expected capacity as written.

Cons: little bit heavy to carry on, but it is natural for considering its capacity.

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  • Austin N.
  • 5/13/2014 4:45:58 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

3 out of 5 eggsAnnoying noise

Pros: Good battery life.
Charges note 8 and htc one fully about twice each.
Sleek design.
Cord included small enough to put in carrying bag that was included.
Box has cool pop-up inside.

Cons: Device makes annoying noise that are audible when charging. When I have speakers plugged into my HTC one while it's charging through the anker, the audio is heard through speakers as well. Annoying enough to take off stars.

Other Thoughts: Shop around. I got it for $25 from here.

Did you find this review helpful? Yes No

  • Anonymous
  • 4/23/2014 10:34:45 PM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsQuick and simple to use

Pros: I love the simplicity of this thing charge it and it charges anything you want simple as that

Cons: I can't find any cons but I've only owned it a week

Did you find this review helpful? Yes No

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