The battery may generate amounts of
If method (2) is used, do not close the
Before turning the
Allow the Audible
POWER switch to OFF or performing
Alarm free standing ventilation during
any maintenance action on any
this 24 hour period.
(5) After recharging connect the battery to
containing a rechargeable battery, open
a switch, resistor and AN/GSM-64C voltmeter as shown
the enclosure door and allow the unit to
ventilate for a minimum of two minutes.
connected directly to the battery terminals as shown in
Do not smoke in the vicinity of the unit
the figure. The power rating of the resistor should not
while opening the door or ventilating.
be below that given in the figure.
(1) If the battery is installed in an operating
Audible Alarm, observe the above warning and then
Be sure switch S1 is in open or OFF
place the POWER switch to OFF. Disconnect the
position prior to connecting to battery.
battery leads and remove the battery from the
(6) Close switch S1, and after a period of 5
+ 1 seconds, note and record the voltage on the
(2) Visually inspect the battery. It should
be free of any evidence of physical damage such as
cracks in the case or obvious leakage of the electrolyte.
Discard if physical damage is evident. For batteries
Do not allow switch S1 to remain closed
contained in an operating component, the battery should
for a period exceeding 10 seconds and
be no more than 2?F. above ambient temperatures.
do not use the test fixture shown in
Any battery in an operating component which is hot to
the touch or which exhibits case deformation caused by
rate, i.e., the ratio of "off" time to "on"
excessive heat is an indication that a battery or power
time should not be less than 9:1.
supply failure has occurred. Discard the battery and
(7) Compare the voltage obtained in step
verify proper power supply operating prior to installing
(6) with those given in the following table:
and operating for an extended period of time with a new
Above 65 F
(3) Connect the battery to an AN/GSM-64C
55 to 65 F.
(FSN 6625-00-02-7894) voltmeter observing proper
45 to 55 F.
polarity. Discard any battery whose open circuit terminal
35 to 45 F.
voltage is less than 18.00 volts.
25 to 35 F.
(4) Recharge new batteries either by (1)
15 to 25 F.
charging the battery in accordance with the instructions
5 to 15 F.
in section e, or by (2) (preferred method) installing the
5 to 5 F.
battery an Audible Alarm and allowing the power supply
-15 to -5 F.
to recharge the battery for a minimum of 24 hours. After
-20 to -15 F.
this 24 hour recharge period, disconnect the battery
(8) Discard any battery whose voltage is
leads and remove the battery from the Audible
below that specified in the table.
Change 2 5-4.1