Lucent Technologies Round Cell Batteries
Issue 3 December 1999 Installation 6 - 19
Initial Charging, continued
Total Hours of
Initial Charge
Initial Charge
Rectifier
Often the plant rectifier which will be used to float a new battery is
unavailable for initial charging. In such a case, use any constant voltage
dc power supply that can supply 2.55 volts per cell and 5 amperes per
string (parallel string charging). For example, 24 cells can be charged by
a 30-volt/10-ampere rectifier by forming two parallel strings of 12 cells
each:
(12 X 2.5 = 30V, 2 strings X 5 amps each = 10 amps).
The initial charge can go unattended provided the rectifier is reliable and
can remain across the cells in case of an ac power failure. Before leaving
the string unattended, install a fuse with an amperage rating equal to ten
times the number of strings in the rectifier’s output leads. Take
individual cell readings to be sure that the cells are charging, i.e., greater
than 2.3 volts per cell and within 50 millivolts of each other.
Table 6-A: Total Hours of Initial Charge
at 2.5 to 2.55 Volts Per Cell
Time on Open
Circuit
Cell Temperature**
81°F (27.22°C)
and Above
65° to 80°F
(18.33° to
26.66°C)
64°F (17.77°C)
and Less
Less than 4
Months
100 Hours 150 Hours 200 Hours
More than 4
Months
150 Hours 200 Hours 250 Hours
*Time on open circuit is to be determined from the “charge by” date
on the shipping container. The “charge by” date is the date when the
open circuit time will be 6 months.
**Cell temperature of the Temperature Reference Cell.
Note
While on initial charge, the electrolyte level will rise substantially
(about 1 inch). Do not remove electrolyte. The electrolyte level in
Round Cells is preadjusted by the manufacturer to be between the level
lines when the cells are floated at 2.17-2.20V/cell for an extended
period of time.
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