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China BAK Battery, Inc. (Parent Company) (Narrative) (Details) (USD $)
 12 Months Ended
Sep. 30, 2012
China Bak Battery, Inc. (parent Company) 2 10.00%
China Bak Battery, Inc. (parent Company) 3 50.00%
China Bak Battery, Inc. (parent Company) 4 25.00%
China Bak Battery, Inc. (parent Company) 5 $ 81,866,049
China Bak Battery, Inc. (parent Company) 6 50.00%
China Bak Battery, Inc. (parent Company) 7 $ 7,645,303
China Bak Battery, Inc. (parent Company) 8 5.00%