Honda 2001 Integra Hatchback Owner's Manual page 196

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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.
NOTICE
Charging the battery with the cables
connected can seriously damage your
car's electronic controls. Detach the
battery cables before connecting the
battery to a charger.
If your car's battery is disconnected
or goes dead, the audio system will
disable itself. The next time 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 119).
Battery
Maintenance