It appears that the electrolyte level indicators are unreliable. I found this out the hard way. I religiously checked the indicators before, during and after trips. On our last trip, we woke up one morning with an extremely low battery voltage and of course almost all electrical systems were down. I again checked the Trojan indicators but also pulled the caps off to find that the cells were almost completely dry. I refilled with clean, but not distilled water and am hoping for the best. I also invested in an old fashioned hydrometer to keep an eye on the specific gravity. Keeping my fingers crossed that I haven't ruined $800 worth of batteries.