44 Owner’s Manual
Wanco® Metro™ Message Sign
External AC-powered charger
To charge the batteries with the external AC-powered charger, located inside the
battery box:
1. Observe battery safety precautions (see “Safety” on page 41).
2. Observe the following charging requirements:
■ Avoid charging batteries at temperatures above 120°F (49°C).
■ Never charge a frozen battery. Thaw batteries completely before charging.
■ Always charge batteries fully. Undercharging causes stratification and may result in
the message sign shutting down unexpectedly.
3. Connect the charger to a standard 120-volt or 240-volt commercial power outlet.
■ If the charger appears not to be working, the fuse on the charger may be blown, or
the power outlet may not be switched on.
■ The charger will not overcharge the batteries, even if left unattended for an
extended period.
4. Charge the batteries until they reach 12.65 volts DC.
5. After charging is complete, disconnect the charger from the power outlet and stow the
power cord inside the battery box.
6. Use the controller to program the message sign if necessary.
7. Close and latch the battery box.
Cleaning
■ Observe battery safety precautions (see “Safety” on page 41).
■ Keep batteries clean to avoid accumulation of dust, dirt, and grime.
■ To clean batteries, use a solution of 50% baking soda and 50% water. After cleaning,
rinse batteries with clean water and allow to dry thoroughly.
■ Clean battery terminals, particularly if they are warm, hot, or corroded. Scour the
terminals and the inside of the cable clamps using a battery post or clamp cleaner, or a
wire brush, until they have a bright metallic shine.
■ At least once a year, visually inspect terminals and cables for signs of corrosion,
especially in hot temperatures.
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