Before replacing the battery on the motherboard, you have to shut down the system. Then, turn off the power supply and remove the power cord. Please wear the static wrist band if you have. As we know, static may cause the motherboard defective. Then, take out the old battery and replace the new one. After replacing the new battery, clear the COMS jumper on the motherboard. Re-configure the BIOS setting and SAVE and EXIT.