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.
Wait until you hear about this neat invention called a “smart lock”. It uses this marvelous key invention you kindly detailed but it also uses magic powered rocks that can send small vibrations in the air to communicate with other magic rocks at home. If their magic energy source is depleted the object you refer to as a “key” may also be operated on this mystical lock to which the lock then whispers: “just let people enjoy things”.