Owner’s Manual 41
Wanco® Metro™ Message Sign
Safety
■ Even when the batteries are not in operation, self-discharge generates hydrogen gas
that can explode. Always store and work on batteries in a well ventilated area.
■ Always wear proper eye, face, and hand protection when working on or near batteries.
■ Keep all sparks, flames, and cigarettes away from batteries at all times.
■ Never lean over batteries when testing or charging.
■ To prevent short circuits and sparks, exercise caution when working with metallic tools
or conductors near batteries.
■ To reduce the risk of sparks, ensure connectors make good contact with battery
terminals.
■ Replace cables that you suspect might be worn or damaged. Replace cables that have
visible fraying, cracks, or bare wires.
■ Always disconnect power cable from computer box before disconnecting battery
cables. The computer box is located inside the battery box.
■ If disconnecting message sign battery cables, always disconnect positive (+) cable
first.* Do not allow positive power cable to short to ground.
■ At least once every three months, coat cable connections with a protective spray, non-
metallic grease, or petroleum jelly (such as Vaseline® brand) to prevent corrosion. Keep
battery hold-downs painted.
DANGER
Explosive gases can cause blindness and severe injury.
When working on or near batteries:
■ Wear eye protection
■ Prevent sparks and open flames
■ No smoking anywhere in the vicinity
■ Keep children clear of the area
DANGER
Sulfuric acid can cause blindness and severe burns.
■ Use caution when working on or near batteries
■ Avoid contact with skin, face, and eyes
■ Upon contact, seek medical help immediately
■ Keep out of reach of children
CAUTION
Voltage surge could damage control circuits.
Before working with batteries, disconnect power cable
from computer box.
*Removing the positive cable first is a requirement for negative-ground systems.
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