So now I'm trying to charge my two batteries. I bought a charger that has options of 2 amp, 6 amp, 10 amp (it says boost), and 55 amp battery starter. I'm thinking it wasn't the best choice. In any...
Setting the charger to the 10A scale simply means that is the maximum the charger can deliver. You should have a meter showing the actual current delivery. It should be close to 0 after 36 hours. If it is indeed delivering 10A after 36 hours then go buy a new battery