I am running 3 50 ah Lithium Pro batteries for my trolling motor. So far this has been adequate battery for the way I fish. Unfortunately the middle battery doesn’t get a full charge. 13.42 versus 14.26 for the other two. I’ve moved my middle battery to the front and it then gets to 14.26 resting voltage after charging. I also moved the charging cables around and it makes no difference. I tried isolating the middle battery when charging by disconnecting the jumpers and it still does the same thing. If I plug the charger back in and “recharge” the middle battery gets to 14.26 resting voltage like the other two. I recently ran out of power and it was the middle battery where the BMS shut it down. The other two read 13.8 volts. Unfortunately since I run a 36v Ultrex I was done for the day. I am using an almost new Noco GenPro x4 on the lithium setting for charging. Other than buying a 36 volt battery and 36 volt charger (what Lithium Pros recommended) can anyone explain what is going on here and a potential work around? Based on the lights on the charger it appears the middle battery in the series gets more fully discharged than the other two and then doesn’t charge to full capacity. It seems to me where the issue exists is the way the charger is programmed but I am no electrical engineer. I have not yet measured the voltages at the end of the day but am going to do that.