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

X

- Definition

Subsequent Events 5

+ References

No definition available.

+ Details

Name:	cbak_SubsequentEventsZeroOneZeroSevenSixOneFourSevenEightbJOnepDdlzyCyg
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