I have had my original Ador since 2016, that's 7 years and I have replaced the battery 3 times in that time period without any trouble.
I did have ice build up on it once but that was my fault. No damage to the door.
The Ador locks in place so no animals can push it up and it will not crush...
I used to have a very similar set up to you.
We have a coop attached to a run but we did free range. The run was secure but technically something could dig under. We aren't too concerned because we were in a neighborhood, had NEVER seen a raccoon, coyote, fox or possum, never had our trash...