Page 38
www.enersys.com Publication No. US-FL-IOM-002 January 2007
While specific gravity readings are a good indication of the health of a cell, other readings can
be used to indicate relative health. However, it is highly recommended that a supplimental full
set of readings on each cell (including specific gravity) be taken approximately two years after
service initilization to verify that the floating conditions of the battery are appropriate.
The following schedule is recommended for good maintenance and records.
Monthly
• General appearance and cleanliness
• Charger output amps and volts
• Electrolyte levels
• Cracks in cells or leakage of electrolyte
• Evidence of corrosion at terminals or connectors
• Ambient temperature and condition of ventilating equipment
• Pilot cell voltage, specific gravity and electrolyte temperature
• Evidence of voltage leaks to ground
Quarterly
In addition to the monthly items also obtain and record the following:
• For antimony cells, specific gravity of each cell (optional for calcium cells)
• Voltage of each cell
• Total battery voltage
• Temperature of one cell on each row on each rack
• Randomly select and check 10% of intercell connection resistances
AnnuaIIy
In addition to the quarterly items, also do the following:
• Perform detailed visual inspection of each cell
• Check all bolted connections as indicated in IEEE 450 to see if retorquing is
required. Tighten all bolted connections to the retorque value specified in Table 7.1.
Then obtain and record the connection resistance of cell-to-cell and cell-to-terminal
connections.
• Check integrity of rack.
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. A sample record chart is provided. Make a copy of the chart to use for
your permanent records.
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