First draft of board
        by          
                          Richard Zhou                      
          2 years 11 months        
              Draft of Battery Board Layout
        by          
                          Richard Zhou                      
          2 years 11 months        
              start layout of power board
        by          
                          Richard Zhou                      
          2 years 12 months        
              fix batteryboard issues
        by          
                          Richard Zhou                      
          2 years 12 months        
              Add battery board stuff
        by          
                          Richard Zhou                      
          3 years 1 month