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4. Inspect each cell for cracks, holes or other defective condition. If any defects are found;
replace with new cells.
5. Wash and clean all hardware to remove accumulated dirt and carbonate deposits. Heavy
deposits may be removed by scrubbing with a stiff bristle brush. Corrosion preventive greases
may be removed from connectors, screws, nuts, and washers by washing in alcohol or by
degreasing after they are removed from the cells.
6. Allow all parts to dry thoroughly before reassembling.
7. Inspect all parts and replace those that are damaged or heavily corroded. Replace connecting
straps that are burned, bent or have defective nickel plating. Polish tarnished connecting
straps with an eraser being careful not to remove the plating.
8. Check the battery power receptacle for burns, cracks and bent or pitted terminals. Replace
defective receptacles. They can overheat, arc, depress battery voltage and cause premature
battery failure.
9. Repair or replace damaged battery cases and covers, loose or damaged cover gaskets and
cell hold down bars.
10. Reassemble battery (See 11.0)
11. Clean vent caps (vent plugs). Use hot water to thoroughly wash vent assemblies.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 1001
APR 15/06
10.0 REPLACEMENT OF CELLS AND BATTERY REPAIR
10.1 Replacement of Damaged or Defective Cells
If a cell becomes contaminated, physically damaged, or is defective and must be
replaced, proceed as follows:
1. Discharge the entire battery as per Paragraphs 7.0 / 8.0, remove the shorting
clips.
2. Clean the battery (Paragraph 9.0)
3. Remove enough intercell connectors to permit the cell to be withdrawn from the
battery can.
4. Do not withdraw a cell from the battery unless a discharged or shorted
replacement cell is immediately available.
5. Withdraw the cell, using a cell puller. Always tighten the puller to the cell and pull
in a straight-up direction.
6. Insert the new (discharged) cell, making certain to insert the cell with the polarity
symbols in the right direction. (Cells are connected plus to minus). If the cell is
difficult to insert, apply a light coat of petroleum jelly or silicone grease to the
sides of the cell case before inserting.
7. Replace the intercell connectors, assembling the hardware finger tight.
CAUTION: Do not use “homemade” hardware. MarathonNorco parts are specifically designed to furnish an
adequate electrical connection. Spare or replacement hardware may be obtained from your local
MarathonNorco authorized distributor. Use of “homemade” hardware will void any warranty, and
would not be approved by airworthiness authorities
8. Torque the terminal connection to the values indicated in Table 2 using a
calibrated torque wrench.
9. Charge the battery in accordance with STEP IA.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 1002
APR 15/06
10.2 Replacement of Damaged Power Connectors
In some battery types, the battery is provided with a special quick disconnect receptacle,
such as a type manufactured by Elcon or Cannon, or any of a number of MS type
receptacles. Should one of these become damaged, it will be necessary to replace it with
a replacement part obtained from your local MarathonNorco authorized distributor. Care
should be taken in the removal of this connector to preserve all the hardware and
gasketing, if possible, so that the new part may be installed properly.
To remove the connector, first remove those connections which go to the end cells in the
battery, thus reducing the possibility of a short circuit when the connector body is
removed from the battery can. All MarathonNorco batteries have the same hardware
arrangement for attaching the power connector to the battery as is used on the intercell
connectors. When installing the replacement part, it is necessary to consult Table 2 for
the torque values.
CAUTION: Do not substitute “homemade” or alternate hardware. Care must be taken that the polarity of the
power connector is carefully observed so that, when the battery is installed in the equipment, the
system will function properly. Use of “homemade” or alternate hardware will void any warranty. Only
MarathonNorco approved components may be used in a MarathonNorco battery.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 1101
APR 15/06
11.0 BATTERY DISASSEMBLY AND REASSEMBLY
CAUTION: Exercise care when working around the battery. Avoid the use of uninsulated tools - severe
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Operating and Maintenance Manual For Nickel-Cadmium Aircraft(15)
