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Document and Entity Information
 6 Months Ended
Mar. 31, 2014
May 15, 2014
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 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  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q2