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Anker® Astro Pro2 20000mAh Multi-Voltage (5V 12V 16V 19V) Portable Power Bank External Battery USB Charger for Tablets, Netbooks, Notebooks, Laptops and Smart Phones -- Compatible with HP, Dell, Acer, Asus, Toshiba Notebooks, Google Glass, Nexus Tablets, iPads, iPhone 6 5S 5C 5 4S, Samsung Galaxy S5 S4, S3, Note 4 3 2 and More

by Anker
4.5 out of 5 stars  See all reviews (158 customer reviews) More about this product

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We don't know when or if this item will be back in stock.

Technical Details

  • 20000mAh of capacity, provides 1 full charge to most laptops or approximately 9 cycles to most smartphones.
  • Reliable lithium polymer battery ensures quality. More than 500 recharges over its lifetime.
  • Equipped with two outputs for greater versatility: 1 DC 12V / 4A, 16V / 3.5A or 19V / 3A port and 1 USB 5V / 2.1A port.
  • Slim and stylish aluminum body ensures efficient heat dissipation, lighter weight, and durability. 4 smart LEDs keep you updated as to the remaining capacity.
  • Package contents: 1 Anker® Astro Pro2 20000mAh External Battery, mobile connectors, 10 laptop connectors, 1 USB cable, 1 DC power cable, 1 AC 100-240V UK-standard power adapter, 1 accessories pouch, 1 user manual, 18-month hassle-free warranty. (Apple 30 pin and lightning adapters, not included)

Product details

  • Product Dimensions: 18.5 x 12.5 x 1.5 cm ; 562 g
  • Boxed-product Weight: 1.1 Kg
  • Delivery Destinations: Visit the Delivery Destinations Help page to see where this item can be delivered.
    Find out more about our Delivery Rates and Returns Policy
  • Item model number: AK-79AN20L-SKA
  • Date first available at Amazon.co.uk: 12 Sept. 2013
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (158 customer reviews)
  • Amazon Bestsellers Rank: 21,771 in Electronics (See Top 100 in Electronics)

Product Description

Need to charge more than just your mobile phone? Invest in greater, more versatile power with the Anker Astro Pro2.

A beast of a battery.
When a standard external battery just won't cut it, reach for Astro Pro2. Packed with 20000mAh capacity, this is one portable power pack that's able to charge most phones 9 times, tablets more than once or a laptop one time.

Hugely versatile.
Choose from DC 12V / 4A, 16V / 3.5A, 19V / 3A and USB 5V / 2.1A outputs for greater accessibility. The three voltage selections enable it to charge laptops (that meet compatibility requirements) - in addition to virtually all USB-charged devices (Samsung Tablets not supported).

Laptop compatibility requirements (both must be met), Please check to ensure compatibility before purchasing:
1) Voltage input: 11.5-12.5V, 15.5-16.5V or 18.5-19V.
2) A laptop connector that fits your device's power input port (see below).

Included laptop connector tip sizes (outer x inner diameter in mm):
A - 6.00×4.25 - Sony VAIO
B - 6.25×3.00 - Toshiba Satellite A105, M35
C - 5.50×2.10 - Toshiba T1950, T4700 / Acer Aspire 1200
D - 4.75×1.70 - ASUS Eee 900, 1000
E - 5.50×1.70 - Acer Aspire One AO722 AO725
F - 5.50×2.50 - ACER Aspire 1600, 5610
G - 4.00×1.70 - HP Mini 1000/ 1100 Series
H - 5.00×3.25 - Samsung N130, N310
J - 7.40×5.00 - HP Pavilion DV6 / HP G60, G61/ HP Compaq CQ60, CQ61 / HP 550 / Dell inspiron 1525, E1505
K - 7.90×5.40 - ThinkPad T60, X60, R60

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.

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews
1 of 1 people found the following review helpful
5.0 out of 5 stars Looks great, works great 14 Oct. 2014
Size Name:20000mAh
This is a really nice bit of kit. I originally bought it to take on an archaeological dig over 4 weeks back in the summer, where I would have no access to mains plugs but needed to charge my phone, tablet, laptop and large bluetooth audio system. In addition, I purchased a 28w portable solar charger to go with it.

Because of the number of attachments and voltages available it easily managed to keep everything charged. Back in the real world, I use it as the power supply for my laptop, saving me having to carry the additional cables (it continues to keep the battery pack fully charged whilst running the laptop).

It's a really solid object with rubber feet on the back to stop it slipping. Some reviewers have commented on the weight but larger batteries do weigh a lot, so it's to be expected. As it can replace a laptop charger, it shouldn't be too much of a problem.

At full capacity, it will charge a smartphone several times; a tablet a couple of times and fully charge a laptop once. That is pretty impressive.

In addition, I appreciate Anker's proactively contacting me to check everything was ok and if they could offer any assistance - nice touch. I told them I felt the packaging could be a little more substantial, but otherwise all good.

Handy note: if you are using it with solar, you need to make sure the cable is first connected to the item you want charging before connecting to this unit. There's obviously some clever thing to prevent surges which will cause the battery to stop working until it is being charged again - obviously frustrating after the sun has set. This is not a problem with mains charging.
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16 of 19 people found the following review helpful
1.0 out of 5 stars USELSS WARRANTY !!! 18 Mar. 2013
By ZC21
Size Name:10000mAh|Verified Purchase
Changing my review as after 7 months or so this item stopped working, hardly being used.

I contacted Anker who told me they do not make this item anymore and offered me a 20% refund on the item, what a joke, you are meant to have a one year warranty, at least make the item for one year after you stopped selling it, just a few to cover returns.
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5.0 out of 5 stars It's a beast. Enough said. 1 Jan. 2015
Size Name:20000mAh|Verified Purchase
Never looked back.

I purchased it and the led's rating the power were faulty, contacted the seller and got a swift replacement. I take this thing everywhere. My college bag is always packed so leaving this thing in there isn't usually a big deal. It powers my phone, I don't really use it for my laptop as i'd need a magsafe adapter.
I take this camping, or just use it around campus. My friends always need to charge their phones and I needn't worry about running out of charge.
I never worry about charging my phone at night, sometimes I awake to single digit battery percentage, but just throw it in my bag and it'll be fully charged by the end of first period.

I love this thing, and when it dies, i'll certainly be replacing it. Probably by then i'll be out of college and may need to downsize. I love the capacity though. I probably use it a couple of three to four a week and charge it fortnightly, and sometimes leave it longer than that.
My phone has a huge 3000mAh battery and my friends all have iPhones or Galaxy devices all with battery capacities over 2000mAh.
I'm sure you'd be able to get away with a battery pack thats much smaller, but in my recommendation, if you've got a big bag, you won't notice it, and you won't regret this purchase.
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By Caz
Size Name:20000mAh|Verified Purchase
I've had a few Anker products in the past, and i'm happy to say that they are still running strong and providing the excellent back-up battery capabilities they were meant to do. However, once again (I ordered another version of this previous) I am having problems with this charger. I purchased one from another trader on Amazon and was disappointed that it did not work so sent it back. I questioned myself as to why I had not purchased the Anker product in the first place, and so did so on sending the other back. I've received the Anker version today. Much better boxed, with enough accessories to do what is expected of the charger. However, once again, the connection on the DC output is not stable enough and is causing my device to have power outages when the battery is moved (even slightly) and so i'm in the same boat as before. This time i'm just going to "grin n' bear" it because I really need this battery to do what I do at work. So i'll use tape and make it look a right eye-sore! It will work but not quite as well as i'd hoped. I expect that if I was using the USB output (5v) then I wouldn't have issues, it's just that I need to use the DC output for a 12v device.

Extra note:
On using the device today (day after receiving it) i've found that one of the connections that is supplied is broken and that the black plastic moulding around the DC adaptor end is cracked and unusable. Another let down from a company I put a lot of faith in for quality merchandise. I may return it after all.......

Anker have dealt with this matter extremely well and as such I will have no hesitation in using or recommending them. It is quite acceptable for a product to have issues (after all, not everything can be perfect) but it's the way these problems are dealt with that make a difference. Anker get 5 stars for their customer service.
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5.0 out of 5 stars Worth its price, an excellent choice. 22 April 2015
Size Name:20000mAh|Verified Purchase
This product may seem somewhat expensive at onset, but what you get is pretty neat value for your money.

The metal case is very solid, and not creaky at all. The device was supplied with a large set of adapters that I would assume would fit most common devices you can think of, which is definitely a plus.

The DC output is also functional, and can supply enough current to support even some more power-intensive devices (I myself used it to support an air blower for cosplay, and it worked spot-on for that purpose). Of course, it also has worked very well as a cell phone backup power source for those long days when you use your cell phone intensively all day. I've never ran into capability issues either, as it apparently has enough to run for quite a bit.

If you can live with its large size, you'll get an useful device that will surely serve your purposes. Would definitely recommend to anybody asking.
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Most Recent Customer Reviews
4.0 out of 5 stars but Anker Customer Service was excellent and once the fault was agreed
The first one I had was faulty, but Anker Customer Service was excellent and once the fault was agreed, it was replaced instantly.
Published 4 days ago by Rick
5.0 out of 5 stars Anker Astro Pro2 used with HP Probook 6570b
I tried in vain to use the product. Unfortunately, HP have included a setting in the BIOS of their business line laptops.
Published 20 days ago by Petar Pantev
5.0 out of 5 stars Five Stars
Very good, have used to run a notebook for over 12 hours
Published 1 month ago by Maurice Guy
5.0 out of 5 stars Great solution for travellers.
Excellent product and was able to get six hours of laptop use - fantastic. Excellent customer service too - all queries were answered promptly and efficiently. Read more
Published 1 month ago by Maggie
5.0 out of 5 stars Very useful battery, provides several hours additional use to my...
Contacted Anker support to ask if this would supply power to my ~2010 rebranded Clevo laptop. After providing details, they confirmed that it would. Read more
Published 1 month ago by Amazon Customer
5.0 out of 5 stars Five Stars
Excellent item as described and fast delivery, highly recommended.
Published 1 month ago by Laurence A Frankel
5.0 out of 5 stars Five Stars
Excellent product, doe,s all I need, thanks, d clark.
Published 1 month ago by richard clark
5.0 out of 5 stars Alternative Use To Power My CPAP
Prior to purchase i was in extensive communication with the manufacturer about the performance of this battery as I wanted to use it to power a medical device (GoodKnight 420G... Read more
Published 1 month ago by KeithH
5.0 out of 5 stars Fantastic product. Great when you are on the move ...
Fantastic product. Great when you are on the move with on mains charging points. Gives my Laptop double the Batttery life. Plus Charged my phone several times.
Published 1 month ago by Paul Rowbotham
5.0 out of 5 stars Excellent
Excellent product. I've bought a few bits from Anker and they are all excellent.
Published 1 month ago by MattyB
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