Brunswick Boston Whaler 21 Guardian Series, Руководство по эксплуатации и техническому обслуживанию

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Boat Maintenance Section 6
Batteries
Remove the batteries from the boat during cold
weather or off-season storage. Always protect the
batteries from freezing temperatures.
You must not allow your batteries to become com-
pletely discharged. As a battery discharges, the active
material on both positive and negative plates changes
to lead sulfate, causing the plates to become similar in
chemical composition. The battery electrolyte
becomes weaker and the voltage drops. As the bat-
tery remains discharged, this process continues until
recharging the battery becomes impossible.
Leave the batteries in their plastic boxes. Store the
batteries in a cool, dry location. Check the battery
condition monthly during storage to avoid serious
damage.
Make sure the batteries are fully charged before you
reinstall them.