Will my PIN code still be the same when the batteries have gone flat? Your PIN code will remain the same until you go through the reset code procedure. Related Posts I can’t access my safe as the batteries have gone flat How do I change the Key Pad PIN code? What Happens If My Batteries Run Flat? The batteries in my KeyFree Smart Door Lock are completely flat, how do I open my door? The batteries in my Keyless Smart Door Lock are completely flat, how do I open my door? How do I set the PIN code on my Certified Safe?