Schumacher TB4 - Manual (Page 5)

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Do not store the battery in freezing or below freezing temperatures.
Freezing temperatures will permanently damage the battery.
2.4 Be sure the area around the battery is well ventilated while the
battery is being charged.
2.5 Do not forget the battery during charging. Periodically check it
during the charging process.
2.6 Remove personal metal items such as rings, bracelets, necklaces
and watches when working with a lead-acid battery. A lead-acid
battery can produce a short circuit current high enough to weld a
ring or the like to metal, causing a severe burn.
RISK OF CONTACT WITH BATTERY ACID. BATTERY
ACID IS A HIGHLY CORROSIVE SULFURIC ACID.
2.7 Consider having someone nearby to come to your aid when you
work near a lead-acid battery.
2.8 Have plenty of fresh water and soap nearby in case battery acid
contacts your skin, clothing or eyes.
2.9 Wear complete eye and body protection, including safety goggles
and protective clothing. Avoid touching your eyes while working
near the battery.
2.10 If battery acid contacts your skin or clothing, immediately wash
the area with soap and water. If acid enters your eye, immediately
flood the eye with cold running water for at least 10 minutes and
get medical attention right away. Battery acid can cause blindness
and severe burns.
2.11 If battery acid is accidentally swallowed, drink milk, the whites of
eggs or water. DO NOT induce vomiting. Seek medical attention
immediately.
2.12 Clean the battery connector before charging the battery. During
cleaning, keep airborne corrosion from coming into contact
with your eyes, nose and mouth. Use baking soda and water to
neutralize the battery acid and help eliminate airborne corrosion.
Do not touch your eyes, nose or mouth.
2.13 Remove the battery from the vehicle to charge it. Do not charge the
battery on a surface (such as a kitchen countertop) which could be
damaged by the acid contained inside the battery. Take precautions
to protect the surface on which you charge the battery.