Re: Easy Question: Charging Car Battery Removed From Vehicle?

The only reason they tell you to use a extra cable when charging a
battery out of a vehicle is safety.

If the battery is outside of the vehicle chances are that the battery
is indoors and away from air movement. If this is the case explosive
battery fumes may be present at the battery itself. If your last
connection was made at the battery site the spark resulting may cause
an explosion.

The use of the extra cable nullifies this scenario by taking the
inevitable spark and moving it away from the battery, providing your
last connection is the negative charger to the free end of the extra
cable.
.

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