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.

2 thoughts on “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)

  1. Michael A Keaton says:

    Not bad, but not (quite) as good as expected. 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…

  2. jjceo (jjceo@comcast . net) says:

    Beautifully styled, light weight and powerful battery pack that is ideal for smart phones! 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…

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