Polaris Predator 50 Owner's Manual page 124

Maintenance
Battery
The battery in your Polaris ATV is a sealed battery. The sealing strip cannot be removed.
Never add water to this type of battery.
Keep the battery terminals and connections free of corrosion. If cleaning is necessary,
remove the corrosion with a stiff wire brush. Wash with a solution of one tablespoon
baking soda and one cup water. Rinse well with tap water and dry off with clean shop
towels. Coat the terminals with dielectric grease or petroleum jelly.
Improperly connecting or disconnecting battery cables can result in an explosion
and cause serious injury or death. When removing the battery, always disconnect
the negative (black) cable first. When reinstalling the battery, always connect the
negative (black) cable last.
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WARNING