So I have noticed my trolling motor batts don't last very long at all lately. I really don't use it as much since I have the kicker but I was shooting some spooky fish in the day and figured it would use it. Had a full charge on the batts and only got 3 hours run time. It's an 80lb riptide probly 10 years old. Tried it again on a brand new set of 31 series deep cycles and still only 3 hours. Could it be caused by bad brushes or a bad armature? I don't see how it could but thought I'd ask.