2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 155Get this manual
Clean battery terminals and cable connections using wire brushApply light coat of dielectric grease or petroleum jelly on terminalsClean battery casing and caps using solution of baking soda and waterDo not allow cleaning solution to enter battery, otherwise it will destroy the electrolyteRinse battery with clear water and dry well using clean clothStore battery on wooden shelf in cool dry placeSuch conditions reduce self-discharging and keep fluid evaporation to minimumDuring the storage period, recheck electrolyte level and specific gravity readings at least every 40 daysAs necessary, keep the battery at its upper level line and near full charge as possible (trickle charge) A17E0FA
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2Remove caps and fill battery to UPPER LEVEL line with electrolyte (specific gravity: 1.265 at 20C (68F))3Allow the battery to stand for 30 minutes MINIMUM so that electrolyte soaks through battery cells