Honda CR-V 2000 Owner's Manual page 220

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Battery
If the terminals are severely cor-
roded, clean them with baking soda
and water. Then use a wrench to
loosen and remove the cables from
the terminals. Always disconnect the
negative ( — ) cable first and recon-
nect it last. Clean the battery termi-
nals with a terminal cleaning tool or
wire brush. Reconnect and tighten
the cables, then coat the terminals
with grease.
Maintenance
If you need to connect the battery to
a charger, disconnect both cables to
prevent damage to the vehicle's
electrical system.
The battery gives off explosive
hydrogen gas during normal
operation.
A spark or flame can cause the
battery to explode with enough
force to kill or seriously hurt you.
Wear protective clothing and a
face shield, or have a skilled
mechanic do the battery
maintenance.
On EX model
If your vehicle' s battery is
disconnecte d or goes dead, the audio
system will disable itself. The next
lime you turn on the radio you will
see " Code " in the frequency
display. Use the Preset buttons to
enter the five-digit code (see page
137).
NOTICE
Charging the battery with the cables
connected can seriously damage your
vehicle's electronic controls. Detach
the battery cables before connecting
the battery to a charger.