HONDA 2004 Civic Coupe - Owner's Manual - Manual (Page 256)

If you need to connect the battery to
a charger, disconnect both cables to
prevent damaging your vehicle’s
electrical system. Always disconnect
the negative (
) cable first, and
reconnect it last.
Maintenance
Checking the Battery
253
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.
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