If you do a forum search on BIRD, BIM and Trombetta you will quite a bit of info on this very topic.
You can start by looking at the post in these search results links.
https://www.thorforums.com/forums/se...archid=3467913
https://www.thorforums.com/forums/se...archid=3467915
https://www.thorforums.com/forums/se...archid=3467919
BIRD = Battery Isolation Relay Delayed
BIM = Battery Isolation Module
Trombetta = manufacturer of the relay most commonly used