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Service & equalize the batts and move the neg take off to batt #3.... After you have them serviced and equalized beg borrow or steal a bench top power supply with adjustable voltage control. Start at 13.2V with all battery caps off and bring the voltage up .1V at each step. Using a flash light you want to see all batts beginning to gas at the identical voltage. Cells gassing earlier than others are likely contaminated or beyond useful life. Put a sticker next to these cells to monitor them..We are finding that batteries 1 & 2 from the diagram below, consistently use more water than 3 & 4, by about 1/3rd. The whole bank is nearly 3 years old, and though not as vibrant as when new, they hold their charge well and seem to accept a charge well.