Schumacher SI263 - Manual (Page 18)

Charging a Removed Battery
1. To charge a battery that has been removed from the vehicle,
check the polarity identification marks on the battery post:
POSITIVE (POS, P or +) and NEGATIVE (NEG, N or -). The
positive post is usually marked red and is larger than the
negative post.
2. Attach a 24-inch-long (at least), 6-gauge (AWG), insulated
battery cable to the NEGATIVE (NEG, N or -) battery post.
Twist the clamp back and forth to ensure a solid electrical
connection is made.
3. Connect the POSITIVE (red) output clamp to the POSITIVE
battery post. Twist the clamp back and forth to be sure a
solid electrical connection is made.
4. Position yourself as far away from the battery as possible and
connect the NEGATIVE (black) output clamp to the free end
of the cable.
5. Plug the power cord into an AC outlet.
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