Reset 18V Einhell Battery: 3 Ways

My ways to reset 18V einhell battery 1) Reset using another similar 18V einhell battery Connect the positive terminal to positive and negative terminal to negative using a pair of wire. Let them stay connected for 15 seconds before remove it. The einhell battery has been reset by this method. 2) Use battery from another brands (18V to 20V) Repeat the same steps as method 1 to jump start the einhell battery. 3) Reset using a DC power source Set the voltage to 18v and current to 1A Connect the positive terminal to positive and negative terminal to negative After 15 seconds, remove the wire connection Please take note not to short circuit the battery connection