I was looking at Sonnen Battery specifications.  I found some very interesting specifications.  Batttery voltage 48 to 56 VDC.  Nothing out of the ordainary there.  Cycle life of 10,000 cycles and calendar life of 10 years perked up my interest.  Then I noticed the battery was in 2KW modules and you could have up to 16 modules in parallel.  Then under communications protocols I found "CANbus ready".  It does not take much more to convince me that this in an Electrovaya battery.

http://alternateenergycompany.com/home/pdf/sonnen/sonnen_eco_tech_specs.pdf

http://www.smarterworld.de/smart-power/batterien/artikel/144080/