I have 2-12v, 60ah lithium batteries running a 80# Minn Kota Ultrex trolling motor. After running the trolling motor all day I checked the batteries and one of them had 56% charge left but the other only had 23% left. I can't understand how they could be different since they are wired in series to run the trolling motor. Looks like they should have equalized since they are in series. How can this be?