I purchased the motion sensor which was the 2014 version. The battery died and I need to replace it with a CR2477. It seems impossible to find it in Ottawa, Canada. The 2015 motion sensor comes with a CR2450 battery which is readily available everywhere.
The size of the batteries are:
CR2477 24.5 × 7.7
CR2450 24.5 × 5.0
I can’t return an open battery. It seems just the height is the only difference. Can I purchase a CR2450 and just add a piece of cardboard which would keep it pushed down to the contact?