User Manual
RS02109/0814/CD 20 www.cdtechno.com
Part 9 – Maintenance
9.1 Monthly Inspection
The Liberty 2V battery is a VRLA cell which does not require water additi on and n o sp ec if ic g ra vi t ie s or
wat er lev els ne ed to be ch ecke d thro ugho ut its lif e. H owev er, it i s recom men ded to pr oper ly fo llow t he
below maintenance procedure, t o assure that the batteries are well maintained and r e ady f or ope ra t io n
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 con nec tors.
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 intern al r esist ance of each bat ter y. Chang es over t ime of less t han ±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 Annuall y (including the above)
7. Torque cell bolts to 110in-lbs (12.4 N-m). Any disassembled connections should be retorqued 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 tot al and individual AC ripple current or voltag e.
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 bicarbonat e soda, 1 gallon to 1 lb.
For more information, IEEE 1188 discusses the significance of connection integrity, further maintenance
techniques, and testing information.
Initial Torq ue
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)