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Lucent Technologies Enhanced VR Series Batteries
Issue 5 December 1998
Operation 7 - 3
with either a step or a slope compensation device. For systems
without such a device, it is recommended that the float voltage
be reduced by 3mV/°C/module for the 2VR250E or 2VR375E
and 6mV/°C/module for 4VR125E or 4VR125EL for
temperatures above 25°C (77°F).
Battery String
Float Voltage
It is extremely important to maintain the battery at the proper
float voltage. The string float voltage is determined by the
number of battery modules in the string and by the type of
temperature compensation device employed in the system. The
battery string float voltage can be calculated as follows:
Table 7-A shows the recommended uncompensated string
voltage with these two features as well as without any type of
temperature compensation.
Caution
Failure to reduce float voltages in systems without
temperature compensation may result in premature failure or
thermal run-away.
Caution
Operating Lucent Technologies Enhanced VR batteries for
any length of time outside the recommended voltages and/or
temperatures will result in reduced performance and
premature failure and may reduce or void the warranty.
Battery String Float Voltage =
recommended battery float
voltage x number of modules
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