(3)
Check that color of cell separators is white. Salmon or brown colored separators are defective and should be removed. If separators are defective, return battery for overhaul.
(4)
Check for cloudy or colored electrolyte. This could indicate electrolyte contamination or damaged plates and separators.
(5)
Inspect rubber insulating liner bonded to underside of cover and insulating sleeves around intercell connecting links. If wear is noted, return to overhaul shop for replacement to prevent possible battery shorting.
(6)
Check for loose or corroded connections from battery through circuit breakers to busses and shunt.
(a) Repair or replace defective connecting parts as required.
(7)
Check that electrolyte is up to a point 3/4 inch above the plastic insert immediately after charging or 5/8 inch above the insert 2 to 4 hours after charging. If not, add distilled water. Refer to Storage Battery (Nickel-Cadmium) - Servicing.
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STORAGE BATTERY (NICKEL-CADMIUM) - CLEANING/PAINTING
1. Battery Cleaning
A. General
(1) Battery cells generate gas as indicated by bubbling during and for some time after a charge. The fine spray of water and potassium hydroxide (KOH), which escapes with the gas through the vents, reacts with the carbon dioxide in the air and deposits white crystals of potassium carbonate on the cell tops. This is not corrosion nor does it contain any corrosive properties.
B. Equipment and Materials
(1)
Pail with clean tap water
(2)
Clean cloth
(3)
Nonmetallic brush
C. Clean Battery
(1)
Remove crystalline deposits of potassium carbonate from battery, battery case, and cover with damp cloth and nonmetallic brush.
(2)
Wash entire battery with clean tap water and dry with clean cloth and dry air. Also clean and dry battery tray and support .
NOTE: Keep all utensils and tools used on lead-acid batteries away from nickel-cadmium batteries.
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BATTERY CHARGER UNIT - ADJUSTMENT/TEST
1. General
A. The battery charge is maintained by a pulse-type battery charger (M5) capable of supplying 25 amperes continuously. The battery charger, located on E3-1 electrical shelf, uses 3-phase, 400 cps input power. A battery must be installed in the airplane as a part of the following tests. Battery charger output modes are tested.
B. Equipment and Materials
(1) Heat Gun
2. Battery Charger Test
A. Test Charging Mode (Pulse Mode, Normal Mode)
(1)
Apply APU or engine-driven generator electrical power to 115V AC ground service bus (generator bus No. 1) (Ref. 24-22-0). Disconnect external power from airplane.
(2)
Set dc meter selector switch on P5 panel to BAT. The battery should charge as indicated by the dc ammeter.
NOTE: External power may be used to charge battery; however, charger will not pulse when battery is charged. If external power is used to charge battery, switch to APU or engine-driven generator power before proceeding with test and disconnect external power from external power receptacle.
(3)
When battery is fully charged, charger will pulse. This pulsing is indicated by the dc ammeter swinging from zero amperes to more than 13 amperes every 1 to 60 seconds. The charger should pulse for only 1 to 3 minutes after battery has reached full charge. The charging cycle may be reinitiated for test purposes by opening BATTERY CHARGER circuit breaker on P6-4 panel to cut off input to the charger for 1 second and then closing the circuit breaker.
(4)
Remove electrical power if no longer required (Ref. 24-22-0).
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B. Test Constant Potential Mode (High Temperature Mode)
(1)
Establish condition 2.A.(3).
(2)
Open BATTERY BUS circuit breaker on P6-5. Check that charger stops pulsing, as shown by a steady current reading on the ammeter.
(3)
Close BATTERY BUS circuit breaker. Check that charger resumes pulsing per 2.A.(3).
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