Schumacher SP3 - Manual (Page 6)

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4.3 Do not set the battery on top of the charger.
4.4 Never allow battery acid to drip onto the charger when reading the
electrolyte specific gravity or filling the battery.
4.5 Do not operate the charger in a closed-in area or restrict the
ventilation in any way.
5. DC CONNECTION PRECAUTIONS
5.1 Connect and disconnect the DC output clips only after removing
the AC plug from the electrical outlet.
5.2 Attach the clips to the battery and chassis, as indicated in sections
6 and 7.
6. FOLLOW THESE STEPS WHEN BATTERY IS INSTALLED
IN VEHICLE.
A SPARK NEAR THE BATTERY
MAY CAUSE A BATTERY
EXPLOSION. TO REDUCE
THE RISK OF A SPARK NEAR
THE BATTERY:
6.1 Position the AC and DC cables to reduce the risk of damage by
the hood, door and moving or hot engine parts. NOTE: If it is
necessary to close the hood during the charging process, ensure
that the hood does not touch the metal part of the battery clips or
cut the insulation of the cables.
6.2 Stay clear of fan blades, belts, pulleys and other parts that can
cause injury.
6.3 Check the polarity of the battery posts. The POSITIVE (POS, P, +)
battery post usually has a larger diameter than the NEGATIVE
(NEG, N, -) post.
6.4 Determine which post of the battery is grounded (connected) to
the chassis. If the negative post is grounded to the chassis (as in
most vehicles), see step 6.5. If the positive post is grounded to the
chassis, see step 6.6.
6.5 For a negative-grounded vehicle, connect the POSITIVE (RED)
clip from the battery charger to the POSITIVE (POS, P, +)
ungrounded post of the battery. Connect the NEGATIVE (BLACK)
clip to the vehicle chassis or engine block away from the battery.
Do not connect the clip to the carburetor, fuel lines or sheet-metal