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Introduction: After Yi Liang was reborn, he obtained a manufacturing upgrade system and started with an electric excavator toy. [Detect that the host has completed the production of pure hand-made items, the system is officially opened, and the technological item 'PVC electric excavator toy' is obtained] [Item: PVC electric excavator toy] [Experience: 0/1000] [Source Points: 1] [Note (only): You can advance after reaching full experience, and source points are only used to exchange for the technological information of the advanced items. In addition to obtaining source points, in addition to the source points obtained by purely hand-made items, you can also obtain additional source points by popularizing common science and technology products. ]... Let me go, the energy density of the first-order battery is 300wh/kg, all the technical information. ... Hiss, the second level jumps directly to 480wh/kg, all scientific and technical information. ...