Q & A:
My trolling motor boat battery takes over 18 hours to charge before it is even full. What is wrong?

Well, I accidentally bought a boat deep cycle starting motor battery for my boat's trolling motor instead of a trolling battery for it 3 years ago. I have two battery chargers, and when I use either one to charge my trolling motor battery, it takes over 18 hours to have a full charge. What is wrong? Is the battery not good or something, or is it because I am using a deep cycle boat motor starter battery for my trolling motor?

It's calcified. A deep cycle battery is what you want. Try buying a 'fancy' digital charger that specifically says it can recondition old batteries. The high freq. pulses of high voltage can break up the crust that accumulates on the lead plates of the battery. (full disclosure, I have a Vector battery charger and it has brought a marine deep cycle, lawn tractor, and motorcycle battery back from the dead. It has more than paid for itself.)