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Document and Entity Information
 6 Months Ended
Mar. 31, 2013
May 15, 2013
Document Type 10-Q  
Amendment Flag true  
Amendment Description This quarterly report on Form 10-Q is being filed as Amendment No. 2 to our Quarterly Report on Form 10-Q which was originally filed on May 20, 2013 and amended on July 15, 2013. We are amending and restating our financial statements to: correct an improper offset of trade accounts receivable and customers deposits relating to a customer as of December 31, 2012, which was deemed to be delinquent during the quarter then ended. Accordingly all outstanding amounts owed to us by this customer should have been fully impaired as of March 31, 2013. The Condensed Interim Consolidated Statements of Operations and Comprehensive Loss have been restated to properly reflect the impairment of trade accounts receivable owed by this customer as of March 31, 2013; and the Condensed Interim Consolidated Balances Sheets have been restated to present the correct amount of trade accounts receivable and customer deposits as of March 31, 2013. Revise the disclosure under Part I Item 4 regarding Controls and Procedures. This Amendment No. 2 also addresses certain SEC comments provided to the Company and amends the following accordingly: Part I, Item 1, Condensed Interim Consolidated Statements of Operations and Comprehensive Loss, which have been restated to properly present government grants as part of our operating income/(loss). Part I, Item 1, Note 1, Principal Activities, Basis of Presentation and Organization, to indicate that we do not have claims from other investors except for those originally disclosed. Part I, Item 1, Note 4, Inventories, to present the correct amount of inventories write-down for the three-months ended March 31, 2013. Part I, Item 1, Note 16, Commitments and Contingencies (iii) Guarantees, which now provides more information about the guarantees that we provided to certain suppliers. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), this Amendment contains new certifications pursuant to Rules 13a-14 and 15d-14 under the Exchange Act and Section 302 of the Sarbanes-Oxley Act of 2002.  
Document Period End Date Mar. 31, 2013  
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 2013  
Document Fiscal Period Focus Q2