In the event that the battery in your keyless lock dies, you will have to replace it with a new battery. To do this, remove the lock from the door, replace the dead battery with a fresh one, and test the lock to ensure it is functioning correctly. It is also essential to follow proper battery maintenance procedures, including checking the battery level regularly, using high-quality batteries, keeping the battery compartment clean, and replacing the battery every 6 to 12 months, depending on how often you use the lock.