looks great and works great

GTMax Battery Charger Lanyard SGH i777

When I bought this Astro3E external battery, I was looking basically for two things:

1. High capacity, and
2. A way to quickly charge my Kindle Fire HD 8.9".

I think I found both things in this Astro3E.

The Astro3E has a battery level indicator, in the form of four lights on the front. You press the middle button, and the number of lights that light up correspond to the charge level. You charge the battery by using a micro-USB to USB cable, and plug the USB cable into a USB-AC adapter (or into a charging port on your computer, but this is a much slower way of charging generally speaking). The lights on the Astro3E blink when the battery is charging, to indicate the charge status, and the lights go out completely when the battery is full.

To charge devices with the battery, plug the device into one of the USB ports on the bottom of the battery, then press the middle button to begin charging. The two ports are labeled "Apple" and "Android" respectively. I don't have any Apple devices, so I haven't actually been able to find any difference between the two ports.

Anker sells two different external batteries with the same capacity, 10,000mAh: the Anker� Astro3 and the Anker� Astro3E. Here are the main differences, according to Anker customer support on Amazon:

"1, Astro3 can only be charged via AC adapter,while Astro3E can be charged via USB port of Laptop/PC/wall charger.
2, The maximum current of Astro3 is 2A,while Astro3E is 3A.
3, Astro3 has a DC output(9V~12V) which can charge some cameras,while Astro3E only have USB output(5V)."

So, in my words:

1. The Astro3 can only be charged with the AC adapter they provide you. The plug is proprietary. The Astro3E can be charged with any micro-USB to USB cable and USB-AC adapter, but be sure that your AC adapter has an output current of 1A or higher (check the adapter to make sure).
2. The Astro3 can charge devices that require a 2A current, while the Astro3E can charge faster at 3A. If your device doesn't need that much current though, then the two batteries will probably behave the same way.
3. Astro3 has a DC output, while the 3E doesn't. This may or may not be relevant to you.
4. Astro3 comes with more adapters so that more devices can be plugged into it, while the 3E comes with just 4 adapters, for micro-USB, mini-USB, and two others I don't recognize.

So if you're trying to decide between these two battery packs, hopefully these differences will help you.