Volvo Penta AD31 Owner's Manual page 38

Remove the battery cables, clean the
cable clamps and apply the appropriate
type of grease to the battery poles.
Check the electrolyte level and charge the batteries.
Batteries discharge when not in use, so you should
recharge the batteries once a month, or once every
two months, depending on storage temperature.
The warmer the storage conditions, the faster the
discharging process. The battery can be left on
board if it is fully charged.
Clean and dry dirty and damp cables.
Spray the connection points, contacts
and fuse holders on the engine and
under the instrument panel with Volvo Penta Univer-
sal Oil. Also loosen and clean any oxidized connec-
tion points.
Check all fuses and make sure that
there are spare fuses on board.
Connect the fully charged battery and
grease the poles with pole grease.
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