TB 9-6140-252-13
POST-CHARGING PROCEDURES
INITIAL SETUP:
References
References (cont.)
RESTING BATTERIES
Remove batteries from charger and allow them to settle (rest; cool preferably overnight). See rest times below for
type of testing to be performed. Batteries that are still heated from charging process may give erroneous readings.
TESTING
After resting, if battery Open Circuit Voltage (OCV) and load voltage are above 12.65 VDC and 10.80 VDC
respectively, the battery is good for reissue to fleet as is without need for recharging. If the battery OCV and load
voltage are below 12.65 VDC and/or 10.80 volt respectively, it needs additional charging. If at the end of two charge
cycles the OCV is identical + 0.1 VDC to the previous cycle, the battery has probably reached its potential. Proceed
and use this value for all tests. This value may increase as the battery rests (cools to ambient temperature).
1.
Open Circuit Voltage Test Only: After a rest period of 18 hours minimum, using a voltmeter measure the
batteries OCV which should be >12.85 VDC (new battery) or >12.65 VDC (used battery). Voltmeter should
read in 1/10th volts or smaller units.
2.
Load Test: After a rest period of two hours minimum, measure the battery OCV & load test at a discharge
rate: 550 amps for batteries with a CCA >1000; for CCA <1000 use 350 amps. Apply designed load for
15 seconds (with ambient temperature between 68F/20C to 87F/30C if possible.) Load testing provides
actual engine start simulation load to the battery simulating actual use in teh field. This testing Steps 3 through
5 below allows for fast, easy, and economical determination of a battery's State Of Charge and State of Health.
Use Load Tester 6625-01-539-5418 or similar to perform load tests. Use battery analyzer (490PT)
6130-01-510-9594 or equivalent.
3.
Measure OCV: Using a voltmeter measure the batteries OCV which should be >12.85 VDC (new battery), or
12.65 VDC (used battery). Voltmeter should read in 1/10th volts or smaller units.
4.
Load Test: Follow manufacturer's instructions for your Load Tester, for Steps b and c below.
a.
Attach Load Tester to battery.
b.
Select load value 550 amps if >1000 CCA or 350 amps if <1000 CCA.
c.
Apply load for 15 seconds. While under load monitor the OCV; battery OCV should be > 10.00 VDC at
15 seconds of load. If voltage drops below 10.0 VDC additional charging is required and retest or disposal
recommended for older used batteries or failed again during retest.
d.
After a two minute rest measure the OCV which should have returned to value measured in Step 1.
e.
If time available recharge the battery for approximately one hour to restore energy lost during testing.
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