Document and Entity Information (USD $)	12 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Jan. 09, 2014
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2014
Trading Symbol	cbak
Entity Registrant Name	CHINA BAK BATTERY INC
Entity Central Index Key	0001117171
Current Fiscal Year End Date	--09-30
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding			12,619,597
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well Known Seasoned Issuer	No
Entity Public Float		$ 26,100,000
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY