After a month of inactivity, the battery has 'recovered', and at the 'best' voltage it has available in reserve. It really does sound like it might be a weak battery issue. My question is it normal for the lock to behave in this manner depending on how often the safe is opened? Batteries are new. All Mechanical locks on Fort Knox safes can be replaced with an Electronic lock, a. S&G Mechanical Lock Trouble Shooting FAQ. The S&G electronic locks have a wrong code lockout feature that prevents the lock from operating. If I do not open the safe for about a month, the electronic lock will only make ONE short electronic noise and will still open. Ghostscript Commercial License Price there. If I open the safe on a regular weekly basis as soon as I enter the code the lock will make TWO short electronic noises and then I turn the wheel to open the safe. It appears to be working fine however I noticed something that I would like to see if you may know if it is normal. I have a Fort Knox safe that has an S&G electronic lock.