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Document and Entity Information (USD $)
 12 Months Ended
Sep. 30, 2012
Dec. 28, 2012
Mar. 31, 2012
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2012    
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   12,763,863  
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well Known Seasoned Issuer No    
Entity Public Float     $ 45,600,000
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY