What Drains Car Battery Quickly. The car engine battery also has a PW150 rating. With the negative terminal disconnected a healthy car battery will only self-discharge at 5 per month.

The main cause of consistent battery drain is a malfunctioning system. Thanks for writing in today about the starting issue on your 2003 Honda. An unstable tracker unit can drain your car battery overnight but in most cases the battery itself is the culprit due to weak storage capacity.
When an alternator is not pushing out enough voltage which should be between 135 and 145 volts the battery will drain quickly.
It is even more frustrating if the battery is consistently drained. Related Questions Can you jumpstart a car with a bad alternator. While I will suggest this with the preface of exercising caution you could connect a couple lamps together in parallel to reduce the resistance of the circuit. Lastly if the cars alternator is faulty it will drain the battery at a fast pace as well.

