If you want to be 'safe', use a small 9V battery (new) and attach wires to the + and - fittings. After raising the hood and making sure all of the lights are off (door closed), clip the battery wires to the car battery cables, remove the old battery, put in the new one, tighten down the battery cables, and pull off the 9V battery wires.
If the 9V battery wires come loose with the car battery not in place, wait 20 minutes to let all of the systems in the car shut down, then connect the new car battery.
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My back feels better when I sit in a Volvo seat
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