Allmand Brothers MB 6200 - Manual (Page 51)

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Figure 1. Battery (showing inside elements)
Loose or corroded connections create high resistance that could cause battery bank overcharging or
undercharging and possibly damage the battery bank.
To optimize sign message display, keep the display free of dirt, dust, snow, or any other contaminants.
Remove dust and other items with soft cloth or sponge and water. A mild non-abrasive detergent may be
used on persistent contaminants. In areas where snow is possible, it may be necessary to remove it.
Monthly
Maintain the following items monthly.
Normal Battery Maintenance
Caution
Warning Charging batteries produce hydrogen, which can explode when proper
operating procedures are not followed. To prevent severe personal
injury, death, or substantial property damage when working around
batteries, be extremely careful. Always use approved eye protection,
face shield, rubber gloves, and insulated tools.
It is important to maintain the proper level of electrolyte in the batteries
at all times. If the level is too high the electrolyte will “boil” out of the
top of the battery during charging and corrode the terminal connections.
If the level is too low the battery life will be severely shorten.