My batteries in my hunting rig only get used in September. At the end of Sept they're fully charged, hit the disconnect switch and they're good until next Sept after sitting in the rig as far down as -60F during the winter. The last set of Interstates I changed out after 7 years and I expect to get the same out of this set.
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.