Honda 2003 Accord Sedan Owner's Manual page 299

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Battery
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.
296
Maintenance
Charging the battery with the cables
connected can seriously damage your
car's electronic controls. Detach the
battery cables bef ore connecting the
battery to a charger.