Daktronics MS-2013 Portable LED Scoreboard - Manual (Page 21)

Battery Care & Charging 15
 NEVER smoke or allow a spark or flame near the battery.
 Be extra cautious while servicing the scoreboard to reduce the risk of dropping a tool
onto the battery. It might spark or short-circuit the battery or another electrical part,
which could cause an explosion.
 Remove all personal metal items such as rings, watches, and other jewelry when
working with a lead-acid battery. A lead-acid battery can produce a short-circuit
current high enough to weld a ring or similar item to metal, causing severe burns.
 Use the charger for charging LEAD-ACID batteries only. It is not intended to
recharge common dry cell batteries, which may burst and cause injury to people and
damage to property.
 NEVER charge a frozen battery.
DC Connection Precautions
1. Check the polarity markings on the battery.
2. Attach the positive ring terminals (red or white wires with fuse) from each cable on
the charger to the positive (+) terminals of the batteries.
3. Attach the negative ring terminals (black wires) from each cable on the charger to the
negative (-) terminals of the batteries.
4. When disconnecting the charger, first disconnect (unplug) the AC power cord, then
remove the negative ring terminal from the battery's negative (-) terminal, and
remove the positive ring terminals last.