Up for sale is a photography flash bundle by Quantum Instruments, including : 

-Quantum Instruments Qflash model T2 off-camera TTL flash unit
-Quantum Instruments Turbo 2x2 battery
-Quantum Instruments battery charging cable
-Quantum Instruments power cable for Canon flashes
-instruction booklet for Turbo 2x2 battery

Whole set works great and battery still holds a good charge. I've charged the battery monthly and they still give me hundreds of pops per charge. The battery cells are easily replaceable, however, should you want to get the greatest possible flash output.  I've misplaced the instructions for the Qflash but they are available for download here :
 
http://www.qtm.com/index_qtm.php?show=fetch&type=manual&getme=p494.pdf

Please feel free to get in touch with any questions...