I have had 6 Volt AGM batteries in my boat in the Caribbean for 2 years. Somehow my Link 2000's have allowed my Freedom 25 to apperantly overcharge the batteries as they are buldging and wont hold a charge. I am told that 90% of the crusiers in this area use the Trojan 105's as they work the best and are half the price. Someone said that because the area were my battereies are located is not well vented, that I should not use the Trojans. Any advice on this matter?