Abstract: A lithium-ion battery includes a lithium-ion cell, a positive electrode terminal, a positive/negative electrode insulation sheet, a connector and a housing used as a negative electrode. The lithium-ion cell is arranged in the housing, the connector is arranged between the lithium-ion cell and the housing. The positive electrode terminal is installed on one end of the lithium ion cell. A circuit board is arranged between the battery positive/negative electrode and the lithium-ion cell. A voltage/current control and overcharge/over-discharge protection circuit is integrated on the circuit board. The voltage/current control and overcharge/over-discharge protection circuit can adjust the voltage of the lithium-ion battery to be a voltage of 1.5V/1.2V. The shape and size of the housing can be designed to be any shapes to replace traditional dry batteries according to requirements. The lithium-ion battery can be designed to be using the same port to do the discharging and charging work.