Today I got the batteries out and was planning on getting them ready for this year. My question is how much water to fill it with? Here's the scenario. The starter battery came with the boat I bought last year. Had no problems with it last year. When I opened up the tops, one of the six cells was dry as a bone. Does this mean the battery is shot? I filled it up, not to the top, and continued to fill other five to the same level. I was shocked it took almost a third of a gallon of distilled water to complete this. Does a battery really lose that much water during the winter? They were stored on a piece of wood in the basement all winter and I charged them on the 15 of each month to hopefully keep them working this year. I then opened the deep cycle battery and filled it also, that took about another quarter of the gallon. Now the deep cycle isn't even a year old. Do batteries really lose that much water while being stored? I'm asking for some advice and guidence, Thanks.