You get home, park your car, do some stuffs and go to bed only to wake up the next day and discover your battery is dead. Here are some of the likely culprit PARASITIC DRAIN This means there is something drawing power from your battery while it's parked. If you have your stereo presets, security alarms or clocks running after the engine is off, it can drain your battery. This type of drain is known as parasitic drain. Parasitic drains below 75 milliamps are considered normal, but any parasitic drain over 75 milliamps will drain the battery quickly. The most common causes of parasitic drain are under hood lights, trunk lights, headlights or glove box lights that do not turn off when the door is closed. Relay switches that are stuck in the “on” position can also cause a battery to drain FAULTY CHARGING SYSTEM A faulty or unreliable charging system can also drain the battery while the car is running. When an alternator is not pushing out enough voltage, which should be betwee...