Electronic lock
I have a Browning Silver safe that's close to 30 years old. It had a combo lock on it when I bought it and it worked fine for years but after awhile it became difficult to get into the safe. I would have to enter the numbers mulitiple times and it scared me into action. I called a locksmith and he told me the normal combo locks have plastic gears that wear quickly if used alot.
He offered me a exact replacement, a better combo lock or an electronic lock. He sold alot of them and recommended the electronic lock. It was about $25 more than the better combo lock and I took the door to him and he installed it.
It had a Duracell copper top 9 volt battery that lasted for years. One day when I came into the house I noticed a flashing red light on the bottom of the lock. I found the booklet that came with the lock and it said the battery was going dead and told how to replace it. I had an industrial 9 volt that we put into smoke detectors and put it in.
The battery was brand new but I couldn't get the safe to open. I was in a panic but had to go to work. I worried and fretted until I got home and had time to mess with it but when I got there I still couldn't get the lock to open. I finally called the locksmith that I bought the lock from and the first question he asked was what kind of battery I put in the lock. When I told him he said those industrial 9 volt batteries were junk and would ruin electonic equipment.
He told me to take that battery out and go get a coppertop Duracell. I thought he was full of crap but I was desperate. I pulled the industrial battery, drove to the store and bought a coppertop, installed it and the lock worked just fine. I tested the industrial battery in a couple other devices and it worked just fine so I know it wasn't dead. If this hadn't happened to me I never would have believed it!!!
Since then, if something electronic recommends a specific battery that's what I put in it.
Ironically I found out just the other day that our PASS devices reccomend only Duracell batteries and specifically say not to use the cheap industrial ones.
I wouldn't hesitate to buy a safe with an electronic lock but I would spend the money for a good battery to replace the dead one. It's funny, we spend thousand on guns and equipment but want to cheap out on a battery for our gunsafe.