Lithium batteries are charged with a constant current until the voltage in the cells reaches 4.2 volts. In the next step, the voltage is kept constant and charging continues for a certain period of time, then the charger is cut off after a predetermined time or when the minimum current is reached. In the rare case that the charger does not turn off and the charging current continues, there is an electronic protection circuit on the cell that ensures the safety of the user. But when the batteries are overcharged or discharged
More and more energy enters the cell and as a result, the voltage in the cell increases, which is harmful to the life of the battery and on the other hand, it can create safety risks for the driver. The excess energy entering the battery leads to the production of heat. This means that the temperature of the cell is increasing and chemical reactions begin, which proceed exponentially. Until these reactions can no longer be stopped, and as a result, lead to Exploding or opening the battery shell.