System-S Backup Battery Charger Extender for Amazon Kindle 4 Fire HD WiFi Touch

• Insert four conventional 1,5V Mignon AA size batteries into the pack and have a portable power source
• Total running time with connected battery adapter will be extended for hours (depending on the used batteries up to 8 hours)
• Eliminates traveling with a ac adapter or charging cradle
• Charges your battery or provide backup power
• Lightweight , slim and compact size.

I have used this many times with my cell phone and my Kindle HD. The best part is that it takes AA batteries that I can buy anywhere. I can use either to use or to charge. A+

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I inserted new batteries and tried to charge our Kindle Fire but, it did not work. I also tried charging a Samsung Galaxy S3 and Samsung Galaxy Media Player with no luck. I returned it and am looking for an alternative.