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Document and Entity Information
 3 Months Ended
Dec. 31, 2012
Feb. 12, 2013
Document Type 10-Q  
Amendment Flag true  
Amendment Description This quarterly report on Form 10-Q is being filed as Amendment No. 1 to our Quarterly Report on Form 10-Q which was originally filed on February 14, 2013 with the Securities and Exchange Commission. 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 December 31, 2012. The Condensed Interim Consolidated Statements of Operations and Comprehensive Loss, Condensed Interim Consolidated Statements of Shareholders’ Equity and Condensed Interim Consolidated Statements of Cash Flows have been restated to properly reflect the impairment of trade accounts receivable owed by this customer as of December 31, 2012; and the Condensed Interim Consolidated Balances Sheets have been restated to present the correct amount of trade accounts receivable and customer deposits as of December 31, 2012. Present the correct maturity profile of our long-term bank loans as of December 31, 2012 in Part I, Item 1, Note 8, Long-term Bank Loans and to properly reflect the reclassification in the Condensed Interim Consolidated Balances Sheets. Revise the disclosure under Part I Item 4 regarding Controls and Procedures. This Amendment No. 1 also addresses certain SEC comments provided to the Company and accordingly amends the following: Part I, Item 1, Condensed Interim Consolidated Statements of Cash Flows, which have been restated to properly reflect the reclassification of certain items within cash flows from operating activities. 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 impairment of inventories as a write down of each of the inventory components Part I, Item 1, Note 6, Property, Plant and Equipment, Net, to (i) present the impairment as a write down of each of the property, plant and equipment components; and (ii) provide a description of the impairment analysis of the Company’s property, plant and equipment. Part I, Item 1, Note 6, Property, Plant and Equipment, Net, to move the description of assets pledged for our banking facilities to Note 7 Short-term Bank loans and to present the correct carrying amounts and description of the assets pledged for our banking facilities in Note 7, Note 8 Long-term Bank Loans and Note 9 Other Long-term Loans. 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 Dec. 31, 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   12,619,597
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well Known Seasoned Issuer No  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q1