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Segment Information (Tables)
 3 Months Ended
Dec. 31, 2012
SCHEDULE OF NET REVENUES BY PRODUCT [Table Text Block]
Net revenues by product:                        
    Three months ended December 31,  
    2011     2012  
          %           %  
                         
Aluminum-case cell $ 34,250,788     47.73   $ 9,316,537     14.62  
Battery pack   20,838,921     29.04     22,436,790     35.21  
Cylindrical cells   12,972,890     18.08     19,599,545     30.75  
Lithium polymer cells   2,633,669     3.67     6,935,483     10.88  
High-power lithium battery cells   1,058,689     1.48     5,444,006     8.54  
                         
  $ 71,754,957     100.00   $ 63,732,361     100.00  
SCHEDULE OF NET REVENUES BY GEOGRAPHICAL AREA [Table Text Block]
Net revenues by geographic area:                    
    Three months ended December 31,  
    2011     2012  
          %           %  
                         
PRC Mainland $ 58,773,767     81.91   $ 48,994,581     76.88  
PRC Taiwan   6,521,674     9.09     5,808,968     9.12  
India   2,534,635     3.53     3,055,888     4.79  
Hong Kong, China   2,410,783     3.36     3,997,372     6.27  
Others   1,514,098     2.11     1,875,552     2.94  
                         
  $ 71,754,957     100.00   $ 63,732,361     100.00