A method of operating a rechargeable battery includes performing a first measurement of a first voltage of the battery and performing a first comparison of the first voltage with a first limit voltage. In the charging process of the ball striker, when the first voltage is smaller than the first limit voltage, the battery performs a second measurement of the second voltage of the battery, and a second comparison of the second voltage with the second limit voltage is made. A discharge process of the breakdown process, if the second voltage is greater than the second limit voltage, the battery isexecuted, wherein the first limit voltage is greater than the second limit voltage. A method of operating a rechargeable battery of the present invention prevents existing batteries from being overcharged in a short period of time, avoids accelerating the aging of the battery, and only overcharging of a battery cell is further likely to reach a predefined voltage, thereby eliminating overheating,particularly in combination with fire or explosion.