Yamaha 20D Owner's Manual page 176

1) Disconnect and remove the battery
from the boat. Always disconnect
the black negative lead first to pre-
vent the risk of shorting.
2) Clean the battery casing and termi-
nals. Fill each cell to the upper level
with distilled water.
3) Store the battery on a level surface
in a cool, dry, well-ventilated place
out of direct sunlight.
4) Once a month, check the specific
gravity of
recharge as required to prolong
battery life.
4-12
GB
the electrolyte and