Bad Battery

[nofearengineer]

Well, I checked my batteries a couple of months ago, and they were fine. They are Interstate Megatron Deep Cycle Batteries...a good brand. The first thing I do when I get home from fishing is plug in the smart charger. I keep the terminals spotless. But one of them is now reading 10.6V after the charger shuts down with a green light. The other is at 13.3V

I am wondering if this is what is messed up my trolling motor. I read 23.9 V at the trolling motor receptacle, but the motor is still weak. Has anyone ever had a bad battery whack their trolling motor's circuitry? I'm reaching new levels of desperation now. I was looking at over $1100 to upgrade to a 36V system, but now the bad battery will add about $200 more. Even if I only spend $200-300 to fix my trolling motor, I still have to buy that stinking battery. grrrr. B.O.A.T. "Break out another thousand" is right. I might be off the water a while.