Abstract: The invention discloses a lithium-ion battery with cap charging indication function, including PET sleeve, battery cell, support frame, steel sleeve, PCB board, ring nickel sheet, PET gasket and LED indicator, the inside of the PET sleeve is fixedly installed with cell, the top of cell is fixed with a support frame, the upper of the support frame is fixed with a PCB board, the middle of the upper part of the PCB board is fixed with an LED indicator, and the outside of the upper part of the PCB is fixed with a ring nickel sheet, the outer fixing sleeve of the support frame and the PCB board are installed with a steel sleeve, and the top of the steel sleeve is fixed with an insulating gasket. The invention of new type of PET sleeve is equipped with a cell, and the top of the cell is fixedly installed on the PCB board and the positive contact sheet through the support frame and the steel sleeve.