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Document and Entity Information
 3 Months Ended
Dec. 31, 2014
Feb. 17, 2015
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 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   12,619,597dei_EntityCommonStockSharesOutstanding
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well Known Seasoned Issuer No  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1