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battery generally refers to the number of
Ampere-hours that the battery can deliver when
discharged at the 1-hour rate to 1.0 volt per cell.
"C" Rate
That discharge rate, in nominal or nameplate amperes,
at which a battery or cell will yield its capacity to a 1.0
volt per cell endpoint in one hour. Fractions or multiples
of the C rate are also used. C/5 refers to the rate at
which a battery will discharge its capacity in 5 hours. 2C
is twice the C rate or that rate at which a battery will
discharge its capacity in about 1/2 hour. Example: a 25
ampere-hour battery will have a C rate of 25 amperes, a
C/5 rate of 5 amperes and a 2C rate of 50 amperes.
This rating system helps to compare the performance of
different sizes of cells and batteries.
State of Charge
The amount of stored energy (capacity)
available in a rechargeable battery. Usually
expressed as a percentage of its full capacity.
Electrolyte
The conductive medium that provides for the
movement of ions (current flow) between the
positive and negative plates of a cell; an alkaline
solution of Potassium Hydroxide in nickelcadmium
aircraft cells.
End-of-Charge Voltage
The voltage of a battery at the conclusion of a
charge measured while the battery is still on
charge.
Fading
The loss of capacity that occurs when a battery
is cycled with minimal overcharge. A
correctable condition through re-conditioning
Separator
A material that is used to prevent the metallic
contact between the positive and negative
plates.
Gas Barrier
A membrane in the separator system that
prohibits the recombination of oxygen (produced
at the positive plate) on negative plate.
Nominal Voltage (Name Plate)
The voltage of a fully charged cell or battery
while delivering current. The nominal voltage of
a nickel-cadmium battery cell is 1.2 volts,
therefore a 20-cell battery would have a nominal
voltage of 24 volts, and a 19 cell is 22.8 volts.
(Note: Older batteries use a different
convention for nominal voltage).
Open Circuit Voltage
The voltage of a battery at rest, that is, with no
charge or discharge current flowing.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 INTRO-3
APR 15/06
Deep Discharge (Cycle)
A discharge in which most or all of the available capacity
is withdrawn from a battery and the cells are brought
individually to a zero volt condition.
Reconditioning
A procedure consisting of a deep discharge and a
constant current charge that is used to correct cell
imbalance that may occur during continual cyclic use of
a rechargeable battery.
Shorting Clip
A short length of wire (with or without a low value
resistor) or a metal spring, used to "short" a cell to zero
volts.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 INTRO-4
APR 15/06
MarathonNorco Aircraft Batteries
(Page 1 of 3)
Battery Type Cell Type Battery Type Cell Type Battery Type Cell Type Battery Type Cell Type
10-20H120 20H120 81757/8-3 24H120 BB433/A 36H120 BTSP-900AT 24SP100
10-5H120 5H120 81757/8-4 24H120 BB433A/A 36H120 CA-101 10H120
10-65H120 65H132 81757/8-5 24H120 BB434/A 24H120C CA-103 10H120
10-81H120 81H120 81757/9-2; 36H120 BB476/A 10HE120 CA-106 10H120
18-6H120 6H120 81757/9-3 36H120 BB600A/A 36H120 CA-10N 10H120
19-10H120 10H120 ATCA-21H 20H120 BB641 10H120 CA-121 12M220
19-10H120 (AH-64) 10H120 ATCA-21H-1 20H120 BB649A/A 20H120 CA-125 3H120
19-24H120 24H120 ATCA-21H-2 20H120 BB664/A 10HE120C CA-125-20 3H120
20-14M220 (F-16 to
Block 40)
14M220 ATCA-21H-2H 20H120 BB672/U 3H120 CA-126 3H120
20-18H120 (F16
Block-50+)
18H120 ATSP-280 28SP100 BB676 10H120 CA-13 36H120
20-5H120 5H120 ATSP-400 40SP100 BB678A/A 10H120 CA-154-1 15M220
23-3H120 (F-18 Conv.) 3H120 ATSP-400-2 40SP100 BB693/U 36H120C CA-154-2 15M220
5-81H120 81H120 ATSP-44 44SP100 BB708/A 5H120 CA-154-2A 15M220
81757/10-1 6H120 ATSP-441 40SP100 BTCA-5 36H120 CA-154-3A 15M220
81757/11-1 24H120 ATSP-900L-1 24SP100 BTCA-5-20 36H120 CA-154-4 15M220
81757/11-2 24H120 BA02-04 5H120 BTCA-9-20 24H120 CA-154-5 15M220
81757/11-3 24H120 BA02-05 Blackhawk 5H120 BTCA-9-20A 24H120 CA-154-7 15M220
81757/11-4 24H120 BB400 3H120 BTMA-5 36H120 CA-16N 36H120
81757/13-1 36H120 BB415/U 10H120 BTMA-5-20 36H120 CA-1700 17H100
81757/7-2 12H120 BB432/A 12M220 BTSP-179 17SP100 CA-170A 17H100
81757/7-3 12H120 BB432A/A 12H120 BTSP-400 40SP100
81757/8-2 24H120 BB432B/A 12H120C BTSP-4445L 44SP100
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Operating and Maintenance Manual For Nickel-Cadmium Aircraft(3)
