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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2023
Summary of Significant Accounting Policies [Abstract]  
Schedule of Property, Plant and Equipment Within the property, plant and equipment, the value for construction in process is included within the manufacturing equipment.
Category   Estimated useful life
Leasehold improvements   1-3 years
Manufacturing equipment   3 – 10 years
Computer and electronic equipment   3 – 5 years
Office equipment   2 – 4 years
Motor vehicles   3 – 4 years
Schedule of Amounts and Percentages of Total Revenues The following table sets forth a breakdown of our revenues, in absolute amounts and percentages of total revenues for the six months ended June 30, 2022 and 2023,
   For the Six Months Ended June 30, 
   2022   2023 
   RMB   %   RMB   US$   % 
   (in thousands, except for percentages) 
Sourcing services   1,300    30.4    1,435    198    75.7 
Product sales   2,634    61.6    
-
    
-
    
-
 
Battery-swapping services   343    8.0    461    64    24.3 
Total revenues   4,277    100.0    1,896    262    100.0