Lucent Technologies Enhanced VR Series Batteries
Issue 5 December 1998
Operation 7 - 5
The Warranty Period outlined in Section 12 is based on the
battery temperature, not the ambient temperature. Maintain a
low battery temperature by adjusting the ambient environment
temperature and/or air ventilation. (See Section 6,
“Environmental Requirements.”)
Since hot air rises, the top row of a multi-tiered stand
configuration is likely to have higher temperatures than the
bottom row. When necessary, use fans or other means of
ventilation to minimize temperature variations between modules
in the same string.
Capacity
The capacity of a battery module or a string is expressed as a
percent of its rated value. For example, if a module is discharged
at the 5-hour rate and it lasts 5.25 hours before reaching 1.75
volts, it is said to have 105% of its rated capacity.
Temperature
Correction for
Capacity
The capacity of a module varies slightly with temperature. For
every 1°C (2°F) increase in temperature, there is a corresponding
0.5% increase in capacity. To correct the 1.75 volt capacity to
25° C (77° F), add or subtract the correction factor determined
from Figure 7-1. Use the temperatures recorded at the beginning
of the discharge.
Example
The ambient temperature at start of discharge was 19.4°C
(67°F) and the discharge to 1.75 volts at the 5-hour rate (300
minutes) lasted 292.5 minutes. The uncorrected capacity is
97.5%, i.e., [(292.5/300) x 100 = 97.5%]. From Figure 7-1,
K (the correction factor) equals a positive 2.5% correction at
Caution
Operating Lucent Technologies Enhanced VR batteries
for any length of time outside the recommended voltages
and/or temperatures will cause reduced performance and
premature failure and reduce or void the warranty.
Caution
Lucent Technologies strongly recommends a temperature
compensation device in high-temperature environments.
Failure to use such a device may result in high battery
temperature that can cause premature battery failure and
reduce or void the warranty.
