Maserati Spyder Owner's Manual page 206

Useful hints for extending the
life of the battery
When parking the car, make sure that
the doors, trunk, hood and flaps are
properly closed. All interior lights
should be off.
When the engine is turned off, do not
keep the connected devices switched
on for a long time (for example the
radio, the hazard warning lights, the
fan, etc.).
WARNING If the battery charge
remains below 50% for a long period
of time, it will be damaged due to
sulfating; its performance and starting
power will be reduced and it will be
more subject to freezing(this can
happen even at –10 °C).
8
206 Battery
We recommend to have the battery
charge condition checked, preferably
at the beginning of the cold season, to
prevent the electrolyte from freezing.
This check should be carried out more
frequently if the car is used mainly for
short trips or if it is equipped with
power absorbing devices that remain
permanently on even if when the
ignition key is removed. This applies
above all if these devices have been
fitted "after market".
If the car is not used for long periods of
time, please refer to the section "If the
car is laid up for long periods", in this
chapter.
WARNING If additional systems have to
be fitted in the car, there is the risk of
creating dangerous branches on the
electric wiring, in particular if the
safety devices are involved.