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Starting battery liquid level

Yahoo Message Number: 92456
Our 2002 Intrigue has an Interstate wet-cell starting battery (12-volt Heavy Duty Workaholic 8D-XHD 1155CCA) During a recent periodic check of all the coach batteries, I discovered that the electrolyte level in all 6 cells of my starting battery (see specifics above) were over-full. The coach had been stored for 7 weeks while we were out of the country. During that time the DC and inverter were on and solar was keeping the batteries fully charged. (The DC was on to keep the refer going and the inverter was on to keep the Tivo going. J Solar kept everything charged while we were gone).
We've now been back for a week and plugged into shore power at a campground and all the batteries are fully charged. Whenever I have checked the batteries in the past, I would occasionally have to add water to the deep-cycle house batteries but have rarely ever had to add water to the starting battery. No one has tampered with the batteries. The specific gravity of all 6 cells of the starting battery is reading in the high-fair range at 1.250 and the battery seems strong when starting the coach. So why are the cells of the starting battery now suddenly way over-filled? Any thoughts? Steve B - 2002 Intrigue 11382