RS02250/0717/CD
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Part 9
– Maintenance
9.1 Monthly Inspection
The Liberty 2V battery is a VRLA cell which does not require water addition and no specific gravities or water
levels need to be checked throughout its life. However, it is recommended to properly follow the below
maintenance procedure, to assure that the batteries are well maintained and ready for operation when
needed. A blank inspection report is shown in Appendix E.
1. Visual inspection of the battery for general appearance and connector conditions. Check for
bulging jars, corrosion build up or any signs of heat damage to the jars/covers and connectors.
2. Measure and record the total system float voltage.
3. Measure and record the total system float current.
9.2 Quarterly
(including the above)
4. Optional; measure and record one of the following ohmic measurement: conductance, impedance,
resistance or internal resistance of each battery. Changes over time of less than ±20 % are
acceptable, changes of greater than 50 % require further attention (such as a load test).
5. Measure and record the temperature of the negative terminal on each cell.
9.3 Semi-Annually
(including the above)
6. Measure and record the individual cell voltages.
9.4 Annually
(including the above)
7. Torque cell bolts to 110in-lbs (12.4 N-m). Any disassembled connections should be re-torqued to
110 in-lb (12.4 N-m).
8. Measure and record connector resistance reading. If a value exceeds the average by 10% for
similar connections, see Appendix B and reference IEEE 1188 for more information.
9. If possible, measure and record the total and individual AC ripple current or voltage.
Clean products with a solution of 1 lb of bicarbonate soda to 1 gallon of water, if necessary
CAUTION:
Never use solvents to clean a battery system. Only use a
solution of water and bicarbonate soda, 1 gallon to 1 lb.
For more information, IEEE 1188 discusses the significance of connection integrity, further maintenance
techniques, and testing information.
Initial Torque
Maintenance Re-Torque
Terminal Connectors
110 in-lbs (12.4 N-m)
110 in-lbs (12.4 N-m)
Module to Module Bolts
40 ft-lbs (55 N-m)
40 ft-lbs (55 N-m)
Restraint Bolts
40 ft-lbs (55 N-m)
40 ft-lbs (55 N-m)
