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Intangible Assets, net (Narrative) (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2012
Intangible Assets, Net 2 | $ 88,000
Intangible Assets, Net 3 | 149,000
Intangible Assets, Net 4 | $ 141,000

X
- Definition Intangible Assets, Net 4 + References No definition available. + Details
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Namespace Prefix: | cbak_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Intangible Assets, Net 2 + References No definition available. + Details
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Namespace Prefix: | cbak_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Intangible Assets, Net 3 + References No definition available. + Details
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Namespace Prefix: | cbak_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration