3-247
TM 9-2350-261-20-1
The back of each card also has three sections. The upper left–hand block lists the possible VTM displays and
explains their meanings. This block suggests corrective action for the user. The right–hand side of the card
contains battery test limits for three common military batteries. These limits may be used if the
vehicle/equipment TM does not provide limits. The lower left-hand portion of the card contains a table
showing how to apply the limits to evaluate the battery condition and state of charge.
B A T T E R Y E V A L U A T I O N P R O C E D U RE
1. Use procedures on battery test card to hook-up VTM. The following information will enable the user
to determine the correct tests:
a. Use
(1)
(2)
(3)
b. Use
(1)
(2)
(3)
2. Use
test series 73 and 75 for the following conditions:
Testing a battery pack that is also powering the VTM
Testing a battery series pair that is also powering the VTM
Testing an individual battery that is the only battery in the circuit and is powering the VTM
test series 77 and 79 for the following conditions:
Testing a battery pack that is not powering the VTM-
Testing a battery series pair that is not powering the VTM
Testing an individual battery that is not the only battery in a circuit or is not powering the VTM
test procedure on battery test card to complete evaluation.
a. Evaluate battery condition using battery resistance change test (#75 or #79). Note the result.
b. Evaluate battery state of charge using the battery internal resistance test (#73 or #77). Note the result.
c. Compare test results to limits in vehicle/equipment TM. If vehicle/equipment TM does not have test
limits, use test limits provided in this section. If the battery internal resistance test passes, then the
batteries are fully charged. If the battery internal resistance test fails, then the batteries are not
adequately charged. If the battery resistance change test passes, then the batteries are good and will retain
their charge. If the battery resistance change test fails, then the batteries are bad and will not retain their
charge.
d. If batteries are out of limits, perform one or all of the following:
(1)
(2)
(3)
(4)
Check battery electrolyte level.
Check battery connections and terminals. Clean or tighten if necessary. Check connections between
VTM and batteries.
Refer to vehicle/equipment TM to check battery specific gravity.
Repeat battery resistance change and internal battery resistance tests one time. If internal battery
resistance result (test #73 or #77) is out of limits, then charge batteries. If battery resistance change
result (test #75 or #79) is out of limits, then continue testing to isolate bad batteries.
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