EXHIBIT 10.11


Summary of Guaranty  Contract of Maximum Amount by and among Longgang  Division,
Shenzhen  Branch,  Agricultural  Bank of  China,  Development  and  Construction
(Group)  Company  Limited by Shares  ("Changchun  Co") of  Changchun  Economic &
Technology  Development  District,  Jilin Provincial  Huaruan Technology Company
Limited by Shares  ("Huaruan  Company")  and  Xiangqian  Li dated as of April 5,
2004.

         Changchun Co, Huaruan  Company and Mr. Li signed a guaranty on April 5,
2004  in  relation  to  the  Comprehensive   Credit  Facilities  Agreement  (the
"Agreement") as summarized in Exhibit 10.10. As guarantor, Changchun Co, Huaruan
Company and Mr. Li undertake to assume  joint and several  responsibilities  for
the obligation of Shenzhen BAK Battery Co., Ltd. under the Agreement, subject to
the maximum security  amounts of RMB 100,000,000  Yuan, RMB 100,000,000 Yuan and
RMB 200,000,000  Yuan,  respectively.  The guaranty has a term of two (2) years,
commencing  from the  maturity of the  obligations  of Shenzhen BAK Battery Co.,
Ltd. under the Agreement.