in section e. or by (2) (preferred method) installing the
temperatures above 100'F. At the conclusion of these
battery in the correct monitor cabinet and allowing the
operating periods, the batteries should be retested in
accordance with section d. Since the batteries have not
power supply to recharge the battery for a minimum of
24 hours. After this 24 hour recharge period, disconnect
been operating in the equipment they do not require
recharging prior to test. The tests in section d should
the battery leads and remove the battery from the
thereafter be performed at six month intervals for items
operating at temperatures below 100'F.
battery service life should be 2 to 4 years below 100'F.
If method (2) is used, do not close the
and I to 3 years above 100'F.
d. Testing of Batteries.
Allow the monitor
cabinet free standing ventilation during
this 24 hour period.
The battery may generate amounts of
Before turning the
(5) After recharging connect the battery to a
switch, resistor and AN/GSM-64C voltmeter as shown in
POWER switch to OFF or performing
fig. 7-2. Be sure the leads to the AN/GSM-64C are
any maintenance action on any
connected directly to the battery terminals as shown in
the figure. The power rating of the resistor should not be
containing a rechargeable battery, open
below that given in the figure.
the enclosure door and allow the unit to
ventilate for a minimum of two minutes.
Do not smoke in the vicinity of the unit
while opening the door or ventilating.
Be sure switch S is in open or OFF
position prior to connecting to battery.
(1) If the battery is installed in an operating
(6) Close switch SI, and after a period of 5:t 1
Monitor Cabinet, observe the above warning and then
seconds note and record the voltage one the voltmeter
place the POWER switch to OFF. Disconnect the
battery leads and remove the battery from the
Do not allow switch S1 to remain
(2) Visually inspect the battery. It should be free
of any evidence of physical damage such as cracks in
closed for a period exceeding 10
the case or obvious leakage of the electrolyte. Discard
seconds and do not use the test fixture
if physical damage is evident. For batteries contained in
shown in fig. 7-2 above a 10% duty
an operating component, the battery should be no more
cycle rate, i.e., the ratio of "off" time to
than 2°-3°F. above ambient temperatures. Any battery
"on" time should not be less than 9:1.
in an operating component which is hot to the touch or
which exhibits case deformation caused by excessive
(7) Compare the voltage obtained in step (6)
heat is an indication that a battery or power supply
with those given in the following table:
failure has occurred. Discard the battery and verify pro-
per power supply operation prior to installing and
55' to 65'F.
operating for an extended period of time with a new
45' to 5S'F.
35' to 4S'F.
(3) Connect the battery to an AN/GSM-64C
25' to 35'F.
(FSN6625-00-02-7894) voltmeter observing proper
15' to 25'F.
polarity. Discard any battery whose open circuit terminal
5' to 15'F.
voltage is less than 18.00 volts.
-5' to 5'F.
(4) Recharge new batteries either by (1)
-15' to -5'F.
charging the battery in accordance with the instructions
--20' to --15'F.
(8) Discard any battery whose voltage is below
that specified in the table.
Change 2 7-6.1