Lucent Technologies Round Cell Batteries
7 - 20 Operation and Maintenance Issue 3 December 1999
Replace a Cell in an Existing String, continued
String
Disconnected from
Load/Charger
• Only qualified, trained personnel that have read and understand the
hazards described in the Safety section of this manual should
perform this work. Appropriate protective equipment must be used.
• Unpack and prepare new batteries according to the appropriate
instructions in the installation section.
• In addition to other safety precautions:
– Make sure the existing string has been at float (less than 2.20
volts/cell) for at least 48 hours.
– Isolate the existing string from the charger and load before
making/removing any electrical connections at the battery
terminals.
– Make sure the vent funnel has been properly installed on the new
cell(s).
• When replacing one or more cells in a battery string, the replacement
cell(s) need to be charged according to Table 6-A. The initial charge
can be applied in one of two ways:
– Install replacement cell(s) in the string and then give them an
initial charge.
Note: If the initial charge of the new cell(s) is done within the
string, the number of cells replaced at the same time within a
string should be limited to less than 10% of the number of cells
that are in the string.
– Charge the replacement cell(s) separately following the
appropriate procedures in the installation section prior to
replacement. In this case, following the initial charge, keep the
cell(s) on continuous float at 2.17-2.20V/cell until the
replacement can be made. The time between discontinuing the
float charge at 2.17-2.20V/cell and the completion of
replacement should not exceed 24 hours.
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