this past Saturday I trolled/longlined for about 6 hrs with a 12v 55# Terrova/IP on a Tracker PT175 w/ 60 2smoke. When I got home, I checked the status of the battery before charging, and it was at 75% per the Terrova battery gauge. good maint on the TM battery is the key to getting good service out of the batteries. I had a MG 43# 5 speed before the MK, and could troll 6 hrs as well with no issues. Can't tell you how low the battery was using the MG, but never ran out of juice but one time when I ran the $$$$ out of the TM one day for some reason. Don't know why, just did one day and it did die, but that was the only time. My trolling speeds can vary from .6 up to 1.2mph/gps. Haven't been able to run out of juice on the MK yet, and battery is 2 yrs old I think, three at the most.