Specifications

MARATHONNORCO AEROSPACE, INC.
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00
Page 701
JUL 11/14
7.0 CAPACITY TEST
If following a charge, a noticeable rise in battery temperature has occurred (warm to the hand) allow the
battery to cool prior to proceeding with capacity test. When battery is cool proceed with capacity test
(measure discharge versus time) using one of the following discharge rates:
− C-rate for 51 minutes - 85% capacity requirement to minimum acceptable end voltage of 1.0 volts per
cell for in-service batteries.
− C-rate for 60 minutes minimum for new batteries.
OR
− C/2 rate for 103 minutes - 85% capacity requirements to minimum acceptable end voltage of 1.0 volts
per cell for in-service batteries.
− C/2 rate for 120 minutes minimum for new batteries.
7.1 Interpretation of Capacity Test
If no cells have dropped below 1.0 volt before or at the end of the specified time, stop discharge.
The battery has successfully completed the capacity test.
If cells have dropped below 1.0 volt before or at the end of the specified capacity test time, do not
stop discharge. Battery must be reconditioned (deep cycled) according to Paragraph 8.0.
7.2 Boeing 100%
The following products for use on Boeing aircraft must meet C-Rate for 60 minutes or C/2 rate for
120 minutes on both new and in-service batteries.
MPTC Model MPTC P/N Boeing P/N
CA-27-20 28111-003 10-60707-9
CA-727-20 25582-003 10-60707-10
KCA-727-20 29069-002 10-60707-11
CA-27-20C 28111-004 10-60707-15
CA-727-20CR 25582-006 10-60707-16
KCA-727-20CR 29069-004 10-60707-17
CA-727-20 25582-003 10-60707-10
CA-727-20CR 25582-006 10-60707-16
7.3 TCA-109L-1 (32864-001) and TCA-1069L (33296-001)
These products must deliver 78 minutes to 20.0 V at a 10 amp rate for new batteries.