A Calcium battery is a still a normal lead acid battery; they are usually sealed maintenance free. Calcium replaces antimony in the plates of the battery to give it some advantages including improved resistance to corrosion, no excessive gassing, less water usage and lower self discharge.
If used in a deep cycle situation it is advisable to use a charger designed for calcium batteries of has a calcium charging mode to get the maximum life out of the battery. Calcium cells need a much higher "stratification" charge from time to time.
A car charger for AMG, Gel batterys or, best is a charger with Calcium settings. Can be used IF charging Ampere isnt used high. . Set as low as possibe . Rule of thumb is 10% of the amp-hour rating of the battery .