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TM 11-6140-224-13&P
4-10. Battery Voltage Test
Check the voltage of the BB-542,/U with the TS-352B/U or equivalent as follows:
a.  Read between Pin 1 (minus) and Pin 5 (plus) on the top of 6 pin connector.
b.  If recently charged, voltage should be approximately 26 volts or higher.
c.  If zero voltage is read, apply 30 volt charging source (para 4-11) to battery for 1 minute. Listen for relay
"click" when voltage is first applied.
d. Zero voltage after a 30 volt charging source is applied may indicate a defective control module.
NOTE
Low voltage (25 volts or less) may indicate defective cells, pressure switch con-
trols, or thermal switch. However it may also be due to normal discharge of the
battery.
4-11. Charging Procedures
The battery may be charged from any controlled power supply having an available voltage between 30 and 36 volts, and a
current capability between 200 mA and 6 amperes. However, best results will be obtained by using modified constant
potential charger with the current limited to 2 to 3 amperes, and the voltage set at 31.1 volt. At 2 amperes, 1-1/4 hours are
required for a full charge. At 3 amperes, only 45 to 60 minutes are needed. Charging should be carried out at a battery
temperature of 50-90"F (10-32C). Charging at 32 to 125F (0-520C) is permitted, but will result in a slight reduction in
capacity. Below 30"F, rapid charging will be inhibited by the internal thermal controls and will not take place unless power is
also provided to the heater circuit. Recommended charging conditions for optimum performance are given in Table 4-1.
Table 4-1. Recommended Charge Conditions with Power Supply for Optimum Performance
Battery
Temperature
Current
Voltage
Time
90-125"F
3A
30-32V
1 hour
50-90"F
2A
30-32V
1-1/4 hours
30-50"F
1A
30-32V
2-1/2 hours
Under 30F
4A ∗
30-32V
1-1/2 hours
Power required for internal heater
a.  Charging from a Power Supply at Low Temperatures. Set power supply to specific current and voltage limits.
Connect power supply to BB-542/U through top 6 pin connector using cable ES-D-212028 to any power supply with banana
type outputs. Turn on power supply. Connect jumper plug fabricated as shown in figure 4-1 to 5 pin MS3112E-14-5S
connector on side of battery. This will energize heater circuit.
CAUTION
Jumper plug must be removed except when power is being provided from power supply or battery will
be discharged.
NOTE
Insulate battery from external environment to the greatest extent possible Wrap in towel, sleeping bag,
etc.
4-3

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