I have been using the ChucksAway unit with no problem for a couple of years.
I have exchanged the motor batteries for larger Lithium Ion Vaping batteries so I don't have to replace the batteries or recharge them for 3 to 4 months at a time at least.
I did have a problem with the digital display on the unit fading out. Even with new batteries. It is possible to repair this by cleaning the conductive rubber switch pads and LCD's contact pads. Electronic , mobile phone or watch mending skill is required to do it.
I am happy to do this as a service to others experiencing this problem.
I am currently trying to create my own more robust and simple Dawn to Dusk door operating system.
I would prefer not to have to seasonally change the open and closing times on the Chuksaway unit.
The plan is for the level of ambient light to trigger the door operation.
If I have some success I will post details on this site.
Wish me luck!