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...
Measure the battery terminal voltage. If it has been over 14.2 volts for 24 hours it should be charged enough to test. Hydrometer is a good test. Or take to a battery store to test. At the very least let it sit disconnected 48 hours and see if it holds 12.65+ volts.