Here's a rechargable backup battery that weighs a bit over three ounces. Check out the details:


American Power Conversion Mobile Power Pack's design complements mobile devices including MP3 players, mobile phones and portable gaming systems. Smaller than a deck of cards, this innovative device delivers hours of extra battery power for those gadgets consumers need most while on the go.

APC utilizes lithium polymer battery cells, an advanced battery technology with a higher power density than traditional lithium ion cells, to create a compact solution with high power output. Compatible with a wide range of mobile devices, the Mobile Power Pack can generate up to 55 hours of additional music time for an MP3 device such as the iPod® Nano, and 8 to 10 hours of additional email and talk time for smartphones, such as a BlackBerry®or Palm® Treo™.

The product includes the Mobile Power Pack, an AC to USB power adapter, and a USB to Mini B power cable. The Mobile Power Pack charges most mobile devices using the manufacturer cables; however, APC recommends the use of APC’s USB Charging Cables (sold separately) to ensure compatibility. Currently available in North America, the Mobile Power Pack (UPB10) carries an estimated resale price of $69.99. For more information about APC and its other innovative mobile solutions, please call 800-877-4080 or visit APC’s website at www.apc.com.
http://apc.com/solutions/display.cfm?id=CD8265AE-5056-AE36-FEB38A00EA494C4D

See also:
http://www.gearlog.com/2006/06/08/index.php
http://laptopmag.com/Review/APC-Mobile-Power-Pack.htm


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