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.
Where did you buy them though? First thing I thought of was fakes, which are sold pretty much everywhere online.
I know you said official, but did you actually check that?
Amazon Eneloop official store/Panasonic listing, shipped and sold by Amazon (not a third party seller).