Display states of a battery status indicator

①For a single-ball indicator: 

   Green: Indicates sufficient charge with a higher electrolyte density, causing the green ball to float up.

   Black: Indicates low charge, as the ball sinks and remains on the container's side due to lower electrolyte density. 

   Transparent:  Indicates very low charge or insufficient electrolyte, as the original appearance of the light guide pole is visible through light reflection.

    ②For a dual-ball indicator:

      Green: Indicates sufficient charge.

      White: Indicates low charge.

      Red: Indicates a severe lack of electrolyte.