nickel-cadmium cells used in the battery consist of two
basic typesvented and sealed cells. Most naval aircraft
nickel-cadmium storage batteries employ rectangular
applications and come in both the rectangular and
BATTERY SAFETY PRECAUTIONS
The principal hazard in working with lead-acid
batteries is acid burns when you are refilling or
handling them. You can prevent getting burned by
wearing eyeshields, rubber gloves, rubber aprons, and
rubber boots with nonslip soles. Rubber boots and
aprons are only needed when you are refilling batteries.
You should wear eyeshields whenever you are working
around batteries. Eyeshields will prevent acid burns to
your eyes. Wood slat floorboards, in good condition,
will help prevent slips and falls. Additionally, electric
equipment is reduced.
Another hazard of working with batteries is the
chance of an explosion. Hydrogen gas, a high
explosive, collects while batteries are charging and can
cause an explosion during battery charging. This is
especially true when using the accelerated charging
method. The charging rate should be held to a point that
prevents the rapid release of hydrogen gas. Follow the
manufacturers' recommendations for the charging
rates. Be careful to prevent short circuits while batteries
are being charged, tested, or handled. A spark from a
shorted circuit could easily ignite the explosive gases.
This danger is also true for personnel performing
aircraft maintenance near batteries. Open flames or
smoking are not permitted in the battery charging room.
Use a shop exhaust system to remove the gases.
Use extreme caution when you are installing or
removing an aircraft battery. Batteries are heavy for
their size and awkward to handle. These characteristics
require the use of proper safety precautions.
Aircraft batteries may overheat because of internal
shorting or thermal runaway. In either case, an
overheated battery causes a hazardous condition. When
an overheated battery is detected, crash crew personnel
should open the battery compartment and check for the
! FlameIf present, use CO2 extinguisher.
! No flameIf smoke, fumes, or electrolyte is
coming from the battery or vent tubes, spray
the battery with low-velocity water fog. This
will lower the battery temperature.
CO2 is a good fire-extinguishing agent once a
fire has started. Never spray CO2 from a portable fire
extinguisher into a battery compartment for cooling
or to displace explosive gases. The static electricity
generated by the discharge of the extinguisher could
Following a visual check, allow crash crew
personnel to remove the battery. If additional battery
cooling is required, use low-velocity water fog.
You may use the above procedures on all types of
aircraft batteries installed in all types of aircraft.
If acid or electrolyte from a lead-acid battery
touches your skin or eyes, flush the affected area
with large quantities of fresh water. Report
immediately for medical examination and treatment.
If the electrolyte from a nickel-cadmium
(NICAD) battery touches your skin or eyes, flush the
affected area thoroughly with large quantities of
fresh water. Neutralize with vinegar or a weak
solution (3%) of boric acid. Report immediately for
medical examination and treatment.
What are the two primary sources of
electrical energy for an aircraft?
During normal aircraft operation, what
component maintains the battery in a charged
What are the principal hazards of working
What should you do if acid or electrolyte from
a lead acid battery comes in contact with your
electrolyte from a nickel-cadmium (NICAD)
battery if it contacts your skin?