Lucent Technologies Round Cell Batteries
7 - 8 Operation and Maintenance Issue 3 December 1999
Check Individual Cell Float Voltage
Interval Perform this procedure annually.
Guidelines It is extremely important to maintain the battery at the proper float
voltage.
Determining Float
Voltage
Determine the float voltage as follows:
Battery float voltage = 2.17-2.20 x Number of cells for low specific
gravity (1.215)
For example, a 60-cell string of 2.17 V/cell should be floated at:
Battery float voltage = 2.17 x 60 = 130.2 volts
Individual cell voltages should typically be within ±0.05V of the
average.
Taking Voltage
Readings
• To make battery readings, use a DMM (Digital Multimeter) with the
accuracy of 0.02 percent on the dc scale.
• Check meter accuracy and calibration periodically.
Caution
• Use extreme caution when making voltage readings to prevent
accidental grounding or shorting of leads during test operations.
Connections at the meter should be secure and free of any
possibility of touching or becoming grounded.
• Never remove connections at the meter end without first
disconnecting the test leads from the battery. Remove test lead
connections at the battery immediately after each reading is taken.
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