TM-9-2350-311-20-1
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS
AUGUST 1994
TM-9-2350-311-20-1 - Page 1242 of 1275
TM 9-2350-311-20-1
b. Test
Use test procedure on battery test card to complete evaluation of the M109A2/M109A3/M109A4/M109A5 batteries.
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Evaluate battery pack, battery series, or individual condition using battery resistance change test (series 75 or
79). Note the results.
Evaluate battery pack, battery series, or individual state of charge using the battery internal resistance test
(series 73 or 77). Note the result.
Compare test results to limits on the back of the battery test cards. If the battery internal resistance test
passes, the batteries are fully charged. If the battery internal resistance test fails, the batteries are not
adequately charged. If the battery resistance change test passes, the batteries are good and will retain their
charge. If the battery resistance change test fails, the batteries are bad and will not retain their charge.
.
If batteries are out of limits, perform one or all of the following:
(a) Check battery electrolyte level.
(b) Check battery connections and terminals. Clean or tighten if necessary. Check connections
between VTM and batteries.
(c) Check battery specific gravity (para 8-28).
(d) 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.
I-65/(I-66 blank)
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