Unless you used a smart charger, like a charge wizard module plugged into your dumb charger, you have shortened the life of your batts. The smart charger maintains the battery and stirs it as well as keep it charged up. In addition you need to check the fluids regularly and not let the batts go more than 50% discharge. Go to a service station and have each batt tested. You might have just one with a dying cell that needs to be replaced. My Trojan T125's were 10 years old when I sold them and still going. So on my new to me TT I bought the sames ones and bought the charge wizard module for $25 its worth its weight in gold.