2. Every 12 months, read and record the following:
• individual cell or unit voltages (volts)
• cell-to-cell connection resistance (ohms)
• terminal connection resistance (ohms)
• ambient temperature in the immediate battery environment (˚F or ˚C)
Any connection resistance that exceeds the base value by more than 20% should be
corrected by the procedures of Section 20.
3. If corrosion is present in the connections, clean according to Section 20.1.
4. Whenever the battery is given an equalizing charge, an additional set of readings
should be taken and recorded.
THE ABOVE FREQUENCY OF RECORD TAKING IS THE ABSOLUTE MINIMUM TO PROTECT THE WARRANTY.
This data will be required for any warranty claim made on the battery. For system protection and to suit local
conditions/requirements, more frequent readings (quarterly) are desirable.
Sample record charts are provided on the following pages. Make a copy of the chart to use for your
permanent records.
NOTE:
Some internal failure modes of cell type mP Series cannot be detected by cell or unit voltage
measurements. IEEE-1188 recommends taking an internal ohmic measurement of the cell/unit at
quarterly intervals. These internal ohmic measurements, when compared with baseline value or the
average value, may indicate the beginning of a problem inside the cell. Then corrective actions can be
taken to avoid a battery system failure. EnerSys
®
recommends that you follow IEEE-1188 standards for
internal ohmic measurements for VRLA cell types.
38
www.enersys.com
Publication No. US-MP-OM-001
March 2017
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