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Segment Information
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Segment Information
23. Segment Information

The Company used to engage in one business segment, the manufacture, commercialization and distribution of a wide variety of standard and customized lithium ion rechargeable batteries for use in a wide array of applications. The Company manufactured five types of Li-ion rechargeable batteries: aluminium-case cell, battery pack, cylindrical cell, lithium polymer cell and high-power lithium battery cell. The Company’s products are sold to packing plants operated by third parties primarily for use in mobile phones and other electronic devices.


After the disposal of BAK International and its subsidiaries (see Note 1), the Company focused on producing high-power lithium battery cells. Net revenues for the three months ended March 31, 2020 and 2021 were as follows:


Net revenues by product:


   Three months ended
March 31,		 
   2020   2021 
High power lithium batteries used in:        
Electric vehicles  $215,118   $100,976 
Light electric vehicles   751    34,104 
Uninterruptable supplies   6,685,405    8,763,583 
    6,901,274    8,898,663 
Raw materials used in lithium batteries   -    517,386 
Total  $6,901,274   $9,416,049 

Net revenues by geographic area:


   Three months ended
March 31,		 
   2020   2021 
Mainland China  $6,876,789   $7,625,793 
Europe   -    1,789,045 
Other   24,485    1,211 
Total  $6,901,274   $9,416,049 

Substantially all of the Company’s long-lived assets are located in the PRC.