one project just nailed it. the smaller the pin on the relay the more apt they are to overheat with a decent draw over long term. personally, I like the ones with the larger spade terminals for this reason. I have also used the large, old fashioned battery isolator style that looks like the ford starter relay from the 70-80's vehicles.
https://www.amazon.com/Bosch-3322091.../dp/B0010AH6YM
here is a quick shop lesson on relays and different styles that may look the same but have different insides. some have diodes to help protect the contacts from induced current backflow from the load.(loads with a winding can have induced current when the magnetic field around the winding collapses as power is taken away). anyway, just know there are different types
http://www.autoshop101.com/forms/hweb2.pdf