Product Details
- Amazon Sales Rank: #1244 in Cell Phone Accessories
- Brand: Anker
- Model: AK-79UN5V2-B84A
Features
- High Capacity, 8400mAh; 4 full charges or add 33 hours of talk time to your iPhone 4S / 4G / 3GS; 2-3 full charges for Samsung Galaxy S III, or 300% - 400% to most mobile phones' battery life
- Compact, portable & stylish design; Easily fits into your bag - to provide instant power; PERFECT for long plane flights, road trips, or whenever you need to charge your mobile devices wherever you are
- Samsung Grade A cells high quality Lithium-ion battery ensures reliability; 500 + recharge cycles over the life of the battery
- Output: 2 x 5V USB ports for fast dual charge: 2A port / 1A port (improved from 0.6A for faster charging); LED indicators reveal the battery level; Convenient flashlight updated to prevent accidental activation: lights only after pressing the power button for 2 seconds; Input: 5V 1A, Astro2 charges via standard USB or AC adapter (not included)
- Package includes: Anker External Battery / 3 connectors for most phones / 2 USB power wires (70CM and 15CM) / 1 user manual / 1 convenient travel pouch
Anker® Astro2 Dual USB Output 8400mAh High Capacity Portable Power Bank Backup External Battery Charger with built-in Flashlight for Smart phones, Android phones, PSP, GoPro; iPad mini, iPhone 5 (Lightning Cable not Provided); iPhone 4S; Samsung Galaxy S4, S3, S2, Galaxy Series Smartphones; HTC One X / V / S, Sensation, EVO; Nokia Lumia 920 N9; Motorola Razr; Blackberry Z10; Sony Xperia Z [2 USB Output 5V 1A / 2A, Faster Charging]
Product Description
About Anker® Astro:
Anker® Astro is a line of portable external batteries designed for our modern mobile age. High capacity power and compact designs make these batteries a reliable power companion on the go. With affordable prices and great Anker customer service, never get stranded without power again.
Thanks to our customers, Anker has 5 products listed in the top 10 of Amazon's top-rated Cell Phone Batteries category.
Popular Compatible Models:
Apple: iPhone 5, iPad mini, The retina iPad (iPad 4) (Use with your original Apple Lightning to USB cable)
iPhone 4S, 4, 3GS / iPod / iPad, iPad 2, iPad 3
HTC: 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, S3, S2 / 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 / AT&T Galaxy S2 I777 / Galaxy Nexus / Galaxy Note / Focus S / Infuse
Motorola: Droid Razr, Bionic / Atrix 2 / Triumph
LG: Nexus 4, Optimus 4X, 2X, V, S, T, 3D, 7
Nokia: Lumia 920 900 710 800 / N8 / N9
Others: Blackberry Torch Curve 9900 9360 9320 / Sony Ericsson Xperia Arc S, X10 / PSP / Nook Color / MP3 MP4 MP5 / GoPro / Amazon Kindle, Kindle Fire
Astro2 Spec:
-- Performance for iPhones: 400% battery life
-- Input: 5V / 1A
-- Output: 2 USB 5V / 1A and 5V 2A (@2A total max)
-- Size: 3.7 x 2.4 x 0.8 inch; Weight: 6.5 ounce
-- Input charging time: 6-12h via standard USB or AC adapter (not included)
-- 18 months warranty
Customer Reviews
Most helpful customer reviews
98 of 101 people found the following review helpful.
By r.garcia
After using this battery pack for about a week, I make the following observations, in order of personal significance:1. Build quality: The battery pack feels, in a word, solid. There is no flimsy plastic deflection if you press on it and no creaky or uneven seams.2. Looks: The pack looks great. Yes it is a fingerprint magnet, but it also wipes cleanly to a beautiful gloss to match most smartphones out there.3. Utility: Very versatile. One port for smartphone and most usb powered gadgets, the other higher amperage port for more power hungry devices, like tablets. I've even used this to charge AA batteries with a usb AA charger. There's nothing I've tried that this won't charge. Also has a built in led "flashlight," but more on this later.4. Convenience: This pack will charge easily with any usb charger. Standard micro usb connector means you won't have to go searching for a special cable to plug this in and charge it. This pack will also charge as you are using it. This may seem silly if you're at home, plugging this into your computer or power supply, and your phone into the batter, but if you ever use this with a portable solar charger, as I am with the Goal 0 Zero 19010 Guide 10 Plus Adventure Kit Nomad 7 Solar Charger & 4 AA Battery USB Power Pack, then it is great to charge while the battery pack as per the available light, while still being able to charge your device with the battery pack with reserve and stable power. The led light is also very convenient. Not very bright but it's there and charged up when you need a quick light in the dark, and most importantly, so you can see your cable as you plug it into your device (great for iphone, as there really is no way to feel which side is up or down on the charger cable)5. Support, Brand Name: Honestly I never heard of the brand name. At first glance, it seems like just an "off-brand" made in china product, and the packaging and manual even has chinese alongside english. But the packaging is attractive and not a generic box like you typically see with other generic products. While I have not yet had to call on the company for support, the quality packaging and literature would lead me to believe that this company is out to make a name for itself, and therefore would be responsive. We shall see. The instructions, on the other hand, were terrible. Very engrishy. But the product is so simple and well designed, that I didn't need the instructions.Final observations: Again, great product, feels very solid and seems to be of high quality. No problems yet, charges everything. Worth the money.
92 of 99 people found the following review helpful.
By N. Ta
Here is my unbiased review of Anker Astro 2 8400mAh external battery pack:Charge Efficiency: Its rated at 8,400mAh as it's capacity. The lithium ion battery may have that capacity but it's ability to charge other devices isn't so hot. I understand the Anker power bank needs power of its own to operate and conversion from 3.7v to 5.0v takes energy. I wasn't expecting 100% of 8,400mAh to fully charge into other devices totaling up to 8,400mAh. But I was expecting it to be efficient. I did 5 charge and discharge cycles (though it may not be necessary on lithium batteries but I did it anyways to calibrate it) then I went on with my test to see how much it can charge my Kindle Fire, HTC Evo 3d, HTC Evo, Kindle reader, and portable speaker. Yes, the devices I were charging were completely off to preserve energy for charging only instead of also powering it on. The first charge cycle it totaled 5,425mAh (64% efficiency), 2nd is 6,032mAh (71.81% ), and 3rd is 5,280mAh (62.85%). This means ~28% - ~37% of its 8400mAH capacity is unusable. I predicted at least ~20% of 8,400mAh is powering itself which is 1,680mAh and perhaps some energy is loss through heat. I concluded that the circuitry work on it is not as good and/or the lithium ion battery isn't of "higher" grade technology (ie. Panasonic & Sanyo 18650). It fell somewhat below my expectations regarding its most important function. However, I do have an Incredicharge I-11000 with 11000mAh capacity and it is about 65-70% efficient but much bigger in size. Perhaps this is the best we can get with portable battery technology. Another alternative is to buy a high quality spare battery(ies) specifically for your cell phone as 100% of it's rated capacity will be used to power that device. Though, this is not achievable with Apple products or others without removable batteries and that this method can be expensive and impractical if you plan on buying many different batteries for various products.Time to Charge Anker 8,400 mAh: It takes nearly 8 hours to charge with the included cord and adapter. DC input is rated at 5v/1.5amp which is good, however, the included wall adapter is only 1amp. So the charging could have been quicker if it was included with a 1.5-2amp usb wall charger. Would definitely not charge this thing via a computer (.5amp). By pointing this out it does not mean it's a pro or con since it is accurately stated under product description.Design: Very nicely polished and sturdy case. USB ports and LED light function as described without any problems. The case is the size of a bridge sized Bicycle cards. Easily carry with you where ever. It is dense and not hollow so I would say it is high quality.Mislabeling: At the time of ordering Anker Astro 2 I noticed it indicated the 2 USB port is rated at 1amp & 2amp. However, upon receiving the package it is clearly 0.6 & 2amp. 0.6amp is adequate for phones but that is 40% slower than 1amp. I believe another customer has pointed this out in an earlier review. It appears they have fixed this error.Price: I purchased this mid April for $46.99 but now it is $49.99. Still not a bad deal but price inflation due to more stellar reviews isn't cool. I noticed some feedbacks were left by those who has gotten a free sample for review, could there be a correlation in price increase and demand based on reviews?. Just wanted to let you know the Incredicharge I-11000 I purchased in March went from $49.99 to $79.99 in a span of 1 month. Now I cannot even search for this product on Amazon.com anymore.Customer Service: LaptopMate replied to emails quickly and seems very concern about customer satisfaction. Their 18 months warranty is the most of all power bank I researched.Conclusion: Astro 2 is very convenient device that comes with plenty of adapters (btw, it doesn't come with Apple adapter so use your own). I like the idea of charging on the go but plan ahead to charge the Astro 2 as it takes very long. You can considering looking at the Powergen 8400mAh battery which is an identical replica of each other and same price but the Powergen comes with an Apple adapter. It seems like somewhere in Shen Zhen or Guandong China they make these without branding and you can get them in bulk with customization for advertisements. Ebay "Power Bank 8400mAh" and you will see plenty of clones but they have short or no warranty. I hope this review has been helpful to the readers.
26 of 26 people found the following review helpful.
By Liberal Republical
Lots of devices need more than 1A to charge but there are very few battery packs that will put out that much current. In fact there are few 12V-5V converters that will do that. This battery pack has both the capacity and current output (2A) to charge pretty much anything that takes 5V - phones or tablets. I like the charge indicators and also the flashlight, for emergencies. The instructions were in both chinese and english - and they were adequate. I tried the battery on an iPhone, Kindle Fire and HP Touchpad. All charged correctly. Note that there are two USB outputs - one is limited to 0.6A and the other to 2A. Use the higher current for tablets.
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