Wacker Neuson RD 12A Operator's Manual page 56

Maintenance
Inspect the battery periodically. Keep the battery terminals clean and
connections tight.
When necessary, tighten the cables and grease the cable clamps with
petroleum jelly.
Maintain the battery at full charge to improve cold weather starting.
NOTICE: Observe the following to prevent serious damage to the
machine's electrical system:
• Never disconnect the battery with the machine running.
• Never attempt to run the machine without a battery.
• In the event that the machine has a dead battery, either replace
the battery with a fully charged battery or charge the battery using
an appropriate battery charger.
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RD 12A
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