C&D Technologies RS-1826 Liberty Series 1000 FA Battery - Manual (Page 21)

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2.3.7 Internal Ohmic measurements
There are currently three methods being used today to measure the
internal condition of the battery. Those methods are: Impedance,
Conductance and Resistance.
Whichever method the end user decides to use, consistency in method
must be maintained throughout the life of the product. These measure-
ments provide insight as to the condition of the battery. Do not switch
between manufacturers of equipment. Switching between designs can
cause abnormal changes which may lead to false readings.
During the first 6–12 months these readings will stabilize. These initial
readings should be used as a benchmark or a historical reference. If the
measurements exceed the 12 month readings by 20% or more, the
manufacturer should be contacted.
2.3.8 Recommended maintenance
Based on IEEE 1188 recommendations for maintenance of VRLA
batteries, the following maintenance procedures are recommended.
Use the record form enclosed in this manual to record the readings.
Failure to maintain records may void the warranty.
Monthly
1. Visual inspection of the battery, general appearance and
connections. Check for bulging jars, corrosion build up or any
signs of heat damage to the connections.
2. Measure/record the system voltage at battery terminals.
3. Measure/record the float current.
4. Insure that the ventilation equipment is functioning properly.
5. Charger output and voltage.
Quarterly - perform all of the items mentioned above plus listed
below.
1. Measure and record internal (one of the following): conductance,
impedance or internal resistance of each cell/unit.
2. Measure and record the temperature of the negative terminal on
each cell/unit.
3. Voltage of each cell/unit.
Annually - perform all of the items mentioned above plus listed below.
1. Measure and record the resistance of each connection.
2. Measure and record (one of the following): impedance,
conductance or internal resistance of each unit.
3. Measure and record the torque of each connection.
4. Measure and record the AC ripple current and/or voltage on the
battery.
5. Clean the tops and jars of the battery with a wet towel.
6. If required neutralize any corrosion found at the battery posts with
a one to one (1lb to 1 gal) ratio of water and bicarbonate of soda.