Minimum maintenance - maximum efficiency If you ask for extended watering intervals to the maximum MARATHON Aqua is the right choice. Based on the proven and reliable tubular plate this technology is a further development of this battery type with extremely low maintenance and operational costs. For all capacities water refilling intervals can be extended up to 200 cycles for this range. The new cell construction, with low height plates results allows an extended electrolyte reserve. In addition the low antimony alloy in combination with an optimized charging regime results in a reduced water loss during charging procedures. All these specific characteristics are extremly extending the watering intervals which significantly improves operational profitability.