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Subsequent Events (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012
Subsequent Events 3 | $ 0.001
Subsequent Events 4 | 13
Subsequent Events 5 | 20

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- Definition Subsequent Events 5 + References No definition available. + Details
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Namespace Prefix: | cbak_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Subsequent Events 4 + References No definition available. + Details
Name: | cbak_SubsequentEventsZeroOneZeroSevenSixOneFourSevenEightDEightGdCnRPBxFourF
Namespace Prefix: | cbak_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Subsequent Events 3 + References No definition available. + Details
Name: | cbak_SubsequentEventsZeroOneZeroSevenSixOneFourSevenEightSevenbhThreeStvTBThreeNX
Namespace Prefix: | cbak_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration