2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 348Get this manual
ELECTRICAL
OFF SEASON STORAGE
To prevent battery damage during extended periods of non-use, the following basic battery maintenance items must be performed: &Remove the battery from the machine and wash the case and battery tray with mild solution of baking soda and waterRinse with lots of fresh water after cleaningNOTE: Do not get any of the baking soda into the battery or the acid will be neutralized&Using wire brush or knife, remove any corrosion from the cables and terminals&Make sure that the electrolyte is at the proper levelAdd distilled water if necessary&Charge at rate no greater than 110 of the battery's amphr capacity until the electrolyte's specific gravity reaches 1.270 or greater&Store the battery either in the machine with the cables disconnected, or put it on piece of wood and store in cool placeNOTE: Stored batteries lose their charge at the rate of per dayThey should be recharged to full charge every 30 to 60 days during non-use periodIf the battery is stored during the winter months the electrolyte will freeze at higher temperature as the battery dischargesThe chart at below indicates freezing points by specific gravity