How To Discharge A Car Battery. Attach one black clip of your jumper cables to the negative terminal of the car with the working battery. Attach the other black clip to an unpainted metal surface away from your cars battery.
You just need to know the watts of whatever youre powering. This stops your car battery from returning to its full charge capacity. With the negative terminal disconnected a healthy car battery will only self-discharge at 5 per month.
If you are looking for a cheap device to discharge the battery perhaps it is the best choice.
Car batteries usually have a capacity of around 45 to 60 AHr if you assume the battery is fully charged and in good condition then it should take around 10 hours to discharge it. Parasitic drain is another common cause of why a car battery drains overnight. Additionally allowing your car battery to discharge continuously and enabling lead sulfate to crystalize will shorten its lifespan. Fortunately shopping for a car battery isnt a hassle with expert advice from Advance Auto Parts Team Members.
