Specifications

MARATHONNORCO AEROSPACE, INC.
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00
Page 1001
MAY 10/11
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 Remove enough intercell connectors to permit the cell to be withdrawn from the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: MarathonNorco battery cells and other components are specifically designed to perform as an
integral unit within the battery. Failure to use the proper replacement cells will change the
batteries internal resistance and adversely affect the batteries charge and discharge capabilities.
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.