How To Disconnect Negative Car Battery. Use your wrench to loosen the nut that connects the negative terminal of the battery then proceed to remove the nut completely. Do not let the negative and positive cable ends touch under any circumstances.
A car battery will naturally self-discharge at a rate of 5-15 per month with the negative cable disconnected but is the best option for long-term parking if you cannot hook it up to a charger. When you remove a battery from a car you should ALWAYS disconnect the negative terminal first and then the positive. Watch more How to Make Simple Car Repairs videos.
Differentiate between the negative and positive terminals.
Next lift the terminal off the battery post and place it safely beside the battery. Battery disconnect positive or negative. Watch more How to Make Simple Car Repairs videos. The negative terminal will be marked by a minus sign and black cable and the positive with a plus sign and red cable.
