Specifications

MARATHONNORCO AEROSPACE, INC.
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00
Page 501
APR15/06
5.0 CHARGE (CONSTANT CURRENT)
For batteries that are partially discharged, i.e., batteries received in for service, begin with STEP I
For batteries that are completely discharged, i.e., new batteries, batteries following capacity test, or deep
cycle, begin with STEP IA.
CELL VENTS SHOULD BE UNLOCKED DURING CHARGE.
STEP I Connect battery to charging source and charge at the main charge rate until all cells are
1.55 volts or greater. This usually takes a short period of time.
IF CELL(S) ARE DRY, HIGH CELL VOLTAGE MAY OCCUR (1.76 VOLTS OR
GREATER). FIVE TO TEN CC’s OF DISTILLED OR DEMINERALIZED WATER
MAY BE ADDED TO EACH CELL.
When all cells are at 1.55 volts minimum, reduce charge current to the topping charge rate and
top charge for one hour. Adjust electrolyte during the final 15 minutes of the topping charge in
accordance with Paragraph 6.0. Upon completion of the topping charge, while still on charge, all
cell voltages must be from 1.55 volts minimum to 1.75 volts maximum.
− If cell voltages are from 1.55 volts minimum to 1.75 volts maximum, proceed to Paragraph
7.0.
− If cell voltages are greater than 1.75 volts, one reconditioning cycle should be performed. If
cell voltage is greater than 1.75 following the recharge, the cell should be replaced. Proceed
to Paragraph 8.0 for reconditioning or Paragraph 10.0 for cell replacement.
− If any cell rises to 1.55 volts then decreases below 1.50 volts the cell must be replaced.