Specifications

MARATHONNORCO AEROSPACE, INC.
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00
Page 902
APR 15/06
If the battery has liquid electrolyte on the top of the cells, drain off as much as possible, wash with
water, and air dry. If the electrolyte has overflowed to the extent that it has run down between the
cells, the battery should be completely discharged, disassembled, and completely cleaned before
reassembling.
1. Disassembly -- Disassemble the battery as described in 11.0.
2. With the vent valves in place and locked, wash the cells under running water. Do not allow the
wash water to enter the cell's interior.
3. Dry the cells with clean absorbent toweling or with an air hose.
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.