Always disconnect the negative terminal first. Use a wrench, pliers, or another tool named in the driver’s manual to loosen and remove the nut that's holding the negative terminal in place. Once the nut is removed, gently lift the terminal off the battery post.
It is the same process as above, but after detaching the terminals, do not remove the battery – simpley just attach the charger to the correct terminals. Should you use this tactic, then keep an eye on the charging – as overcharging can seriously damage the battery and cause problems that can become very expensive to fix.
To disconnect a car battery, start by turning off the engine and opening the hood so you can access the battery. Wear eye protection when working with the battery to protect your eyes from sparks. Locate the positive and negative terminals on the battery.
Use a wrench, pliers, or another tool named in the driver’s manual to loosen and remove the nut that's holding the negative terminal in place. Once the nut is removed, gently lift the terminal off the battery post. Make sure to tuck the disconnected terminal away from the battery to avoid accidental contact.
Disconnect the negative terminal first, then the positive terminal. Set aside 10-15 minutes to disconnect the battery, another 10-20 minutes if you need to remove corrosion, and another 10-15 minutes to put it back or install a new one. Reverse the original order and reconnect the positive terminal first, then the negative terminal.
Locate the positive and negative terminals on the battery. The positive terminal will be marked with a “+,” and the negative battery will be marked with a “-.” If there are plastic caps over the terminals, remove those now. Next, use a wrench to unbolt the negative battery cable.