Serviceability Test for Battery, Wet Primary BA-485A/U and BA-485BfU

TB 11-6135-200-25

masking tape to secure the materials and to hold the

3-3. Serviceability Test for Battery, Wet Primary BA-

thermometer against the battery case, on the same face

485A/U and BA-485BfU

as the connector.

Serviceability tests should be conducted on new or

g. With the temperature of the battery less than

offthe-shelf batteries before installation in a missile, on

80°F, connect the test circuit as shown in figure 3-3 to

all batteries in the missile during regular teardown, and

the battery (with shorting strap across pins C and E).

on all batteries turned in for any reason if they have not

The 6-volt indicator lamp must light (k below).

exceeded their shelf/service life. Inventory stock does

h. Connect the appliance plug to a 115 vac source.

not require testing until time of issue of use. To test the

The ammeter should indicate approximately 3 amperes,

BA-485A/U or BA-485B/U, use the procedures in a

(k below).

through o below. If any of the conditions of these tests

i. The 6-volt indicator lamp shall glow steadily, as

are not met, the battery must be considered as

the battery temperature rises. The 6-volt indicator lamp

unserviceable. Refer to paragraph 3-4 for instructions on

may or may not extinguish before the ammeter indicates

the disposition of unserviceable batteries.

an open circuit. If the 6-volt indicator lamp remains on

30 minutes past the time the ammeter indicated an open

a. Set the AN/USM-223 to the 50 volt dc scale and

circuit, slightly tap or jar the battery. If the 6-volt indicator

measure the potential between the positive (+) and

does not extinguish, the battery is unserviceable.

negative (-) terminals posts. The potential must be 0

j. When the 6-volt monitor lamp remains off for

volt.

approximately 10 minutes, record battery temperature

b. Set the AN/USM-223 to the R x 10,000

and time. Allow heater power to remain on and record

ohmmeter range and measure the resistance between

time and battery temperature the instant the ammeter

the battery case and each of the exposed pins in

indicates an open circuit.

connector J544 (pins A through J), and the + and

k. The battery is considered unserviceable if: (1)

terminal posts. The resistance for each must be infinity.

Monitor 6-volt indicator lamp is off at the start of test (a

c. Mount connector P544 on connector J544 (with

slight tap or jar could correct this problem).

the shorting strap between pins C and E). Set the

AN/USM-223 to the R x 10,000 range and measure the

(2) Ammeter indicates open circuit at the start of test (a

resistance between the + and terminal posts, and

slight tap or jar could correct this problem).

between pins A and G, pins D and F, pins D and J, and

pins F and J. The resistance for each reading must be

(3) Once the 6-volt monitor lamp extinguishes, it shall

infinity.

remain off until paragraph n below.

d. Set the AN/USM-223 to the R x 10 range and

measure the resistance between pins B and H. The

(4) Battery temperature reaches 125°F. or greater.

resistance must be between 45 and 65 ohms.

I. The ammeter can indicate a partial open circuit

CAUTION

(I ½/2 amperes) for a period of time, then a complete

Perform the following tests as quickly

open circuit as the temperature rises (record

as practicable, and with a low current

temperature and time).

ohmmeter. Use the AN/USM-223 if it

m. Allow the battery to cycle for 21/2 hours after the

is available. If the AN/USM-223 is not

ammeter initially indicated an open circuit. Record

available, use an ohmmeter that

battery temperature and time each instant the ammeter

applies less than 10 milliamperes.

indicates a closed or open circuit.

(The current output of Test Set,

n. At the end of the 2/2 hour cycling period,

Arming Mechanism (8020264) is 9

disconnect the 115 vac source and allow the battery to

milliamperes maximum.) DO NOT use

cool. Record the battery temperature the instant the 6-

the TS-352B/U for this test.

volt indicator lamp lights. If the battery temperature is

less than 83 °F at this instant the battery is

e. Remove the mating plug P544 from connector

unserviceable.

J544 and measure the resistance between pins C and E.

Do not prolong this test. The resistance must be

o. Disconnect battery from test circuit and install

between 20 and 35 ohms.

Mating Connector P544 (NSN 5935-00-539-2230) on

f. Construct a temperature chamber using the

battery connector.

packing materials supplied with the battery, and the

instructions TB 11-6135-200-25 in paragraph 3-1. Use