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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)
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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
| 66 answered questions

Price: $49.99
Sale: $19.99 & FREE Shipping on orders over $35. Details
You Save: $30.00 (60%)
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  • 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. 18-month hassle-free warranty.
5 new from $19.99 1 used from $19.99

Frequently Bought Together

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) + Anker® Astro Slim3 6000mAh Ultra-Slim 2-Port External Battery with Built-in Micro USB Cable for USB Devices (Black)
Price for both: $49.98

Buy the selected items together


Special Offers and Product Promotions

  • Get a $100 Amazon.com Gift Card: Get the Discover it chrome card and get a $100.00 Amazon.com Gift Card* after your first purchase within 3 months. Learn more.

Technical Details

  • Size (LWH): 4.92 inches, 0.39 inches, 2.52 inches
  • Weight: 4 ounces
  • Battery Type: Lithium Polymer
  See more technical details

Product Details

  • Product Dimensions: 4.9 x 0.4 x 2.5 inches ; 4 ounces
  • Shipping Weight: 6.4 ounces (View shipping rates and policies)
  • ASIN: B00CTK762E
  • Item model number: AK-79ANS4552-BA
  • Average Customer Review: 4.4 out of 5 stars  See all reviews (658 customer reviews)
  • Amazon Best Sellers Rank: #2,793 in Cell Phones & Accessories (See Top 100 in Cell Phones & Accessories)
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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.
• 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.

Get to know us.
The Anker Astro external battery has been voted #1 in class by thousands of online reviewers, while our renowned customer service has made us a fan-favorite across the web.

Customer Questions & Answers

Customer Reviews

It also fits right in the side pocket of my purse so easy to carry.
Nancy
Another great feature is that you can charge two devices at once since it does have another regular USB out port in addition to the built-in micro USB out cable.
Victor in the OC
The device holds the charge very well and does charge devices pretty quickly.
pinkxter

Most Helpful Customer Reviews

96 of 101 people found the following review helpful By Michael A Keaton on April 18, 2013
Verified Purchase
This power bank is small, light, manageable, well designed, and well priced.

That being said my phone has an 1800mAh battery. Being that this battery is rated at 4500mAh, even after considering power lost to heat, and internal processes the bank has built in, it seemed reasonable for me to expect 2 charges. Sadly the Astro Slim2 delivered just a little over one.

Considering the quality, and thoughtful design, if you often find yourself out and about and away from a charger in your car or at home, this unit is still worth the money, and I'd still recommend it.

(Update)

Anker responded to the negetive aspects of my review in a ridiculously fast manor, offering a replacement and seeming incredibly helpful, but I don't believe the item to be defective, still be of quite good quality, and am happy to have it. And now you can be sure the customer quality is impeccable. Again not a bad product if it's for you, but I can highly recommend Anker products in general, because they stand behind their products, and try to make sure their customers are happy.

(Update #2)

Anker mailed me an unsolicited replacement just in case original unit was under-performing. After a few discharges I've come to the conclusion that the new unit is slightly outperforming the old. I am currently getting about one and one half charges, and suspect I may get a full two charges, if I were to completely shut my phone down during charging, but for what are probably fairly obvious reasons this isn't really practical. As stated earlier, the company has quality, affordable products with unbelievable customer service. If you're on the fence about purchasing a product the company offers, you should take their willingness to go above and beyond into consideration.
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Length: 7:55 Mins
This is a beautiful product for anyone who travels or works long days. You can charge your smart phone while on the bus, train, and plane or in a meeting without looking for one of those hard to find wall plugs. This powerful battery pack can charge your smart phone multiple times or extend the use of your smart tablet. (Please see the details listed below in my test results)

It is beautifully designed, extremely thin, small and portable. It uses Grade A power cells which will provide years of recharging capability, up to 500 plus times. The battery pack has the power storage of 4500 mAh. It has a standard USB port and a built in Micro USB cable that can both output 5VDC at 1 AMP each, simultaneously. It can charge two devices at the same time. My testing reveals that this battery pack is powerful and effective with the capability of outputting 3700 mAh of its charging capacity which is 82.2 percent of its rated capacity which is an excellent result.

What I like is that the unit is priced well and it is so small and portable but can really carry a lot of power. It easily fits into your purse, briefcase or pocket. Since it is only 0.42 inches thick it can easily slip into a jacket pocket for easy access. You could recharge most smart phones from 2 to 3 times with this power cell. The battery pack is about the same size as an iPhone 4. It weighs in at 4 1/8 ounces and it has a matte finish that helps you to grip it and it does not show fingerprints. I have included a video of this review and I hope it is helpful to you.
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53 of 56 people found the following review helpful By Joseph Siu on April 28, 2013
I think Anker finally hit the sweet spot in portable USB batteries with the Astro Slim2, and I've used my share of them. Of course, as an ultra-slim battery with just 4500mAh, this isn't going to charge your tablet or jump start your car. What it will do, though, is give your precious cellphone that extra kick when you're just about to beat that Angry Bird level and your battery is down to its last breath. It will do it in style, too.

The Anker Slim2 is about the size of your typical new-gen cellphone; it is nearly identical in size and thickness to my Google LG Nexus 4. This means that it is just the perfect size to slip into the inside pocket of a suit or jean pocket. I can't mention how many times I've had to leave my other portable batteries behind because they were just too bulky or awkwardly shaped, rendering them completely useless when I needed them most. There's no need for a second thought with the Slim2; just slip it into a pocket and go. Forgot to bring a cable? No sweat; IT COMES WITH A BUILT-IN CABLE.

Did I mention that it comes with a built-in cable?!

Sorry for those in the proprietary cable camp (I'm looking at your, Apple), the built-in cable is Micro-USB only. Which means that, oh I don't know, it will work with JUST ABOUT ANY Android cellphone in the market. When not in use, the cable tucks neatly into the battery charging port. If your device doesn't have a Micro-USB charging port, Anker showed some love by including a USB output port as well so you can BYOC (Bring-Your-Own-Cable). Anker threw in a Mini-USB and a 30-pin iPhone adapter too, just for kicks. Furthermore, the Slim2 has a 4-LED display that tells you how much battery is left so you're never left wondering.

This all sounds amazing, so you might be wondering why the 4-star.
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