Eneloops would only last about 3 weeks. And disposable last 2 months. This door is used a lot and since it has Zwave and a door open sensor it sends info on every open.
Bonus, since it can handle the lipo AA batteries that put out 1.8v and it gives the motor more oomph I made the battery pack give 7.2v and it never sticks anymore.
This is a garage-door so its not critical access but is used a lot.
This is how electronic locks work in prisons and jails. Motor in the doorframe with a bolt, power on to unlock, fails secure in the event of a power outage.
In an event of a fire that sounds quite uncomfortable. On the other hand my knowledge about prisons isn’t very profound.