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Anker® Astro Slim2 4500mAh Ultra-Slim Portable Charger External Battery Power Pack for Samsung Galaxy S5, S4, S3, iPhone 5S, 5C, 5, 4S, iPad Air, mini, Note 3, HTC One, One 2 (M8), Motorola Droid, MOTO X, LG Optimus and most other USB-charged devices (Apple adapters - 30 pin and lightning, not included)

by Anker
4.6 out of 5 stars  See all reviews (168 customer reviews) More about this product

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Technical Details

  • Dual ports capable of supplying simultaneous, full-speed charges (1A each) to devices. Made with Grade A cells and premium microchips.
  • Packs a punch: enough power for 2-3 charges on most phones, while compact design (0.39in) and matte surface allow for easy stacking during use.
  • Micro USB hideaway cable reduces obstruction and the number of cords in your bag; USB output also available for iPhones or other USB-friendly devices.
  • Charges via Micro-USB power wire (included) or AC adapter (not included). Input: 5V / 1A; Output: USB 5V / 1A + 1A.
  • Package contents: Astro® Slim2 External Battery Pack, Micro USB cable, instruction manual.


Product details

  • Product Dimensions: 12.5 x 1 x 6.4 cm ; 113 g
  • Boxed-product Weight: 181 g
  • 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-79ANS4552-BA
  • ASIN: B00CTK762E
  • Date first available at Amazon.co.uk: 18 Mar 2013
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (168 customer reviews)

Product Description

Our goal was simple: design a powerful battery that stacks up - literally.

Slimmer and stronger.
At (0.39in), Anker's Astro Slim2 comes with enough power for 2-3 charges on most smartphones in a compact, easy-to-grip case. Sized especially to stack behind your 4.3in smartphone for uninterrupted phone-use while charging. An LED column lets you know just how much juice is left without diverting attention from your work.

Say goodbye to knots.
Who doesn't hate tangled cables? With an intuitively-sized micro USB cord for Android, the Slim2 allows you to carry your power all-in-one. Using an iPhone? Plug into the USB port and charge up via your OEM cable.

No expense to speed.
What's better than a high-capacity battery that slides into your pocket on-the-go? One capable of simultaneous, full-speed charges. Both ports supply 1A of power with complete safety to your phones, so you can power up in no time and make the most of your day.

For optimal use.
• For simultaneous, max-speed charging of your Astro and other devices, check out Anker's new 25W 5-port wall charger or dual-port 24W car charger.
• Compatible with all Apple and Android smartphones, tablets and other 5V input USB-charged devices. The iPod nano, the Samsung Tab2, Asus tablets (not include the Nexus 7), the LG G2 and some GPS and Bluetooth devices are not supported.
• The built-in Micro-USB cord may not work with thicker bumpers or cases.The included Micro USB cable is compatible with the Samsung Galaxy S5, Note 3 and other Micro USB 3.0 devices. To connect, insert the cable's Micro USB tip into the larger of the two connection ports on your device.
• 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
2.0 out of 5 stars Second Anker product that doesn't work properly 22 Mar 2014
Size Name:4500mAh|Verified Purchase
I have decided to give up on Anker after trying two of their products and found that the charging of devices is not reliable.

It seems to have problems with both my iPhone and Samsung Galaxy S4 - it will just suddenly stop charging - for no reason - and at any time.

Their products do look great but I have experienced much better reliability with Powergen products.
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1 of 1 people found the following review helpful
2.0 out of 5 stars Low battery charge 14 Dec 2013
Size Name:4500mAh|Verified Purchase
At least this product that i recieved doesnt work properly, only let me to charge my phone once, instead of twice that it is suppouse to be. My battery phone is 1950mAh and the powerbank 4500 mAh, i bought before this one, an ACC powerbank and it works perfectly. So i recomend the other one instead this one.
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1 of 1 people found the following review helpful
Size Name:4500mAh|Verified Purchase
I have been using this for 3 months every day. It is still working and fully charge my SIII 2-3 times. Nice. The only downside is that the battery occasionally need reconnect when it has been connected the phone for some time.
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1 of 1 people found the following review helpful
3.0 out of 5 stars Not quite 3200mAh....!! 23 Mar 2013
Size Name:3200mAh Black|Verified Purchase
Bought this for my Sony Xperia Z which has a battery size of 2330mAh. The Anker Battery Pack Charger only charged it to 80% which would rate this product at about half the size of what its advertised at. Other than that, its a decent size (small enough to fit in your pocket) and great with the built in connector.
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13 of 16 people found the following review helpful
5.0 out of 5 stars Nicely designed product 20 Aug 2012
By mwarner
Size Name:3200mAh White|Verified Purchase
I contemplated a number of products before finally deciding on the 3200mAh Anker. I intend this to provide my phone with extra charge whilst out walking & using the phone as a GPS - I tend to find that after 5-6 hours of this kind of heavy use my phone runs out of juice!

My requirements were:

1. Able to provide roughly one full charge of my Samsung Galaxy Note (2500mAh battery)
2. To be slim enough to not really notice you are carrying it in a pocket (thickness is more important than width and height here). I compared it to an iPhone 4S and it is slightly shorter, but pretty much the same width and depth.

I also liked the following about this item:

1. It had a built-in light, which I will actually find quite useful
2. It had a built-in Micro USB cable, making it more compact than having to carry around a separate cable.
3. The price was very reasonable

Once in hand, I was impressed with it's build quality and weight and, comparing it to my workmate's 5000mAh I was pleased I ordered the lower capacity version - mostly due to the excellent form factor.

Today I decided to perform a test to see how efficient battery to battery power transfer is. I ran my phone down until it asked for power & charged it until the (fully charged) extended battery ran out of juice.

The recharge took 3 hours and took the phone from 16% to 87% battery before running out of power. The phone was on during this time - the previous 3 hours had used 16% battery, so I assumed that the battery usage over the charge period would be the same.
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4 of 5 people found the following review helpful
5.0 out of 5 stars Excellent 17 Nov 2011
Size Name:3200mAh Black|Verified Purchase
Excellent little emergency charger / powerbank. charged my galaxy s twice with a little to spare. This suggests that the 3200 mah stated capacity is reasonably accurate. It has one micro sd plug which hides inside the case so no need to carry a cable around with you for most android phones. Also comes with longer cable with another micro usb plug on the end. It comes with 2 sockets one standard size usb for charging ipods ect, it charges at around 700 ma. The other socket is a micro usb for charging with your standard android wall charger. A good sign of this product is that while charging it gets slightly warm as you would expect it too when the charge indicator nears full the unit cools off indicating that the charge is being controlled correctly. The size is very small and neat. The finish is a shiny piano black. on the whole the unit looks and feels good quality. The 4 led indicators showing how much capacity is left seems accurate. Cant comment on the little.torch as i wouldnt use it tbh but hey its there and usable. All in all a great little device.
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5.0 out of 5 stars great little iPhone recharger when travelling 23 Jun 2014
By Tantra
Size Name:4500mAh|Verified Purchase
Great little unit - I always carry it with me when I'm travelling incase my iPhone charge runs low - It will recharge it fully and reasonably quickly - i would not be without it. I even have one of the bigger ones to recharge my iPad when i occasional travel with that too
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5.0 out of 5 stars Wicked piece of kit 20 Jun 2014
Size Name:4500mAh|Verified Purchase
Great bit of kit. Charged my phone 5 times while at a festival and still had juice in it when I got home.
Very slim and compact ... Would recommend
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Most Recent Customer Reviews
1.0 out of 5 stars Anker® Nano
Great design and quality as always for any item from Anker® . Unfortunately product overall create some dissapointments as mentioned 4500mAh dosent looking right. Read more
Published 26 days ago by Mr Pawel Palka
5.0 out of 5 stars Awesome portable charge point for your phone
Product is awesome! its like carrying your wall power socket in your pocket. Charge your phone anywhere or even charge while you're using the phone. Read more
Published 27 days ago by Amazon Customer
5.0 out of 5 stars Portable power for smaller devices
I really rate this portable power pack and I've now been using it for 8 months. It's ideal for charging small electronic devices I use mine for charging my phone and... Read more
Published 29 days ago by Muncus
5.0 out of 5 stars Life/battery Saver!
Everyone knows that smartphone batteries have a habit of dying before the end of the day. This battery is a must have really. Read more
Published 1 month ago by Niall Grant
5.0 out of 5 stars Small yet powerful
My wifes iphone is always running low on battery so purchased this for her handbag. Its small and light enough to not notice carrying, then has enough stored charge for a couple of... Read more
Published 1 month ago by M. Dyne
5.0 out of 5 stars Five Stars
Everything was perfect !!!!!!!!!!!!!!!!!!!!
Published 1 month ago by spiros
4.0 out of 5 stars Does what it says on the tin
Charges the phone just like it says it will. Really handy for when you are going camping or on a long distance cycle for charity like I was [...]. Read more
Published 1 month ago by Mr. Idris C. Wilson
5.0 out of 5 stars Good job
I'm iPhone 5 owner. Astro Slim works perfect with it. One thing for iPhone is missing - lighting. I have to use lighting adapter. But it's no big issue.I would definitely recommend
Published 1 month ago by Miron
5.0 out of 5 stars My top purchase for travelling!
I have just returned from a 5 month trip with this device and I must say it was one of the best things that I bought! Read more
Published 1 month ago by James
5.0 out of 5 stars Gobsmacked!!!
I have to say I am gobsmacked at how good this portable charger is. It charges waaaay faster than plugging the phone into mains. Brilliant!!!!
Published 1 month ago by MrBigChop
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