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8. Remove personal metal items such as rings, bracelets, necklaces, and
watches when working with lead-acid batteries. Lead-acid batteries
produce a short-circuit current high enough to weld a ring or the like to
metal, and thus cause a severe burn.
9. Use the inverter•charger for charging lead-acid batteries only. Do not use
it to charge nickel-cadmium or dry-cell batteries commonly used with
home appliances and electronic equipment. These batteries may burst and
injure persons and damage property.
10. NEVER attempt to charge a frozen battery. Charging a battery when its
temperature is below 32°F (0°C) is inefficient and ineffective. If possible,
gradually warm the battery above 32°F (0°C) before charging.
11. If you need to remove a battery, always remove the ground terminal from
the battery first. Make sure all accessories are off so you don’t cause an
arc.
12. Be sure the area around the battery is well ventilated.