b) To reduce risk of battery explosion, follow these
instructions and those published by battery
manufacturer and manufacturer of any equipment you
intend to use in vicinity of battery. Review cautionary
marking on these products and on engine.
The instructions for a battery charger
For all grounded cord-connected battery chargers:
GROUNDING AND AC POWER CORD CONNECTION
INSTRUCTIONS – Charger should be grounded to reduce
risk of electric shock. Charger is equipped with an
electric cord having an equipment-grounding conductor
and a grounding plug. The plug must be plugged into
an outlet that is properly installed and grounded in
accordance with all local codes and ordinances.