Exhibit 31.2

CERTIFICATION

I, Tony Shen, certify that:

|1. | I have reviewed this annual report on Form 10-K of China
    BAK Battery, Inc.;                                                                                                                                                                                                                                                                     
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|2. | Based on my knowledge, this report does not contain any
    untrue statement of a material fact or omit to state a material fact
    necessary to make the statements made, in light of the circumstances under
    which such statements were made, not misleading with respect to the period
    covered by this report;                          
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|3. | Based on my knowledge, the financial statements, and
    other financial information included in this report, fairly present in all
    material respects the financial condition, results of operations and cash
    flows of the registrant as of, and for, the periods presented in this
    report;                                             
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|4. | The registrants other certifying officer and I are
    responsible for establishing and maintaining disclosure controls and
    procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and
    internal control over financial reporting (as defined in Exchange Act Rules
    13a-15(f) and 15d-15(f)) for the registrant and have:
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| | (a) | Designed such disclosure controls and procedures, or
    caused such disclosure controls and procedures to be designed under our
    supervision, to ensure that material information relating to the registrant,
    including its consolidated subsidiaries, is made known to us by others
    within those entities, particularly during the period in which this report
    is being prepared;         
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| | (b) | Designed such internal control over financial reporting,
    or caused such internal control over financial reporting to be designed
    under our supervision, to provide reasonable assurance regarding the
    reliability of financial reporting and the preparation of financial
    statements for external purposes in accordance with generally accepted
    accounting principles;                
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| | (c) | Evaluated the effectiveness of the registrants
    disclosure controls and procedures and presented in this report our
    conclusions about the effectiveness of the disclosure controls and
    procedures, as of the end of the period covered by this report based on such
    evaluation; and                                                                                                        
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| | (d) | Disclosed in this report any change in the registrants
    internal control over financial reporting that occurred during the
    registrants most recent fiscal quarter (the registrants fourth fiscal
    quarter in the case of an annual report) that has materially affected, or is
    reasonably likely to materially affect, the registrants internal control
    over financial reporting; and
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|5. | The registrants other certifying officer and I have
    disclosed, based on our most recent evaluation of internal control over
    financial reporting, to the registrants auditors and the audit committee of
    the registrants board of directors (or persons performing the equivalent
    functions):
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| | (a) | All significant deficiencies and material weaknesses in
    the design or operation of internal control over financial reporting which
    are reasonably likely to adversely affect the registrants ability to
    record, process, summarize and report financial information; and
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| | (b) | Any fraud, whether or not material, that involves
    management or other employees who have a significant role in the
    registrants internal control over financial reporting.
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/s/ Tony Shen 
Tony Shen Chief Financial Officer

December 14, 2009

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