Honda HR-V 2020 Owner's Manual page 569

Charging the Battery
Disconnect both battery cables to prevent damaging your vehicle's electrical system.
Always disconnect the negative (–) cable first, and reconnect it last.
uuBatteryuCharging the Battery
1Battery
When you find corrosion, clean the battery terminals
by applying a baking powder and water solution.
Clean the terminals with a damp towel. Cloth/towel
dry the battery. Coat the terminals with grease to
help prevent future corrosion.
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