CAUSES OF DISCHARGED BATTERY
Generator not charging battery.
Generator belt slipping.
Wires short-circuited or grounded.
Plates not covered with electrolite.
Defective or leaky cell.
Excessive lamp load.
Excessive use of lamps when engine is stopped.
Car not being run fast enough to charge at sufficient rate.
Using starter too much.
Cut-out not working properly.
Broken or loose connection between generator and battery.
(Storage battery efficiency in winter is half that of summer.)