Commercial in confidence
Page 13
mcmurdo
mcmurdo
mcmurdo
mcmurdo
3.6.
Battery replacement
It is essential for safety and the reliability of the equipment that only the correct type of battery is
fitted. Use only McMurdo approved parts.
All batteries carry a label showing the replacement battery part number.
Battery voltage test
Lithium batteries have a very constant discharge voltage over time, hence voltage is not any
indication of the capacity remaining in the battery. The only test which can be applied is to
measure if this plateau voltage has been reached (as it is slightly lower than the fresh battery
voltage) and to assume that the life of the battery has been compromised if this plateau voltage
has been reached.
There are two separate supplies from the battery, hence there are two voltages to measure. The
open-circuit voltages must be 10.8 V or greater and 5.4 V or greater, otherwise the battery must
be replaced. Voltages should not be measured within 5 minutes following activation or self-test.
The kit contains the following parts :-
Battery pack assembly
86-430
O ring
86-425
Screw M4 x 30 SS PH Pozi x3
86-412
Screw M4 x 60 SS PH Pozi x1
86-413
Frangible tab
86-436
Batteries contain hazardous material and must be handled and disposed of
in accordance with local regulations.
Replacement procedure
CAUTION
: Before undertaking any work, Service Agents are advised to carry out an inspection
of the SART to ensure that it is in a suitable condition to be returned to service after the battery
change.
Remove the three screws visible when viewing the underside of the SART. When the pole
bracket is fitted, its retaining screw is longer than the other two screws; when no bracket is fitted,
all screws are the same length. Discard the removed screws. Remove the pole bracket if fitted.