OPERATION
Operation
The nominal rated capacity is at a battery
temperature of 30°C (86°F) for C5 or 25°C (77°F) for
C6. The optimum lifetime of the battery depends
on the operating conditions (temperature and
depth of discharge). Higher temperatures shorten
the life of the battery; lower temperatures reduce
the available capacity. The capacity of the battery
falls considerably under an internal temperature
of 5°C (41°F). Optimal battery life is obtained when
the battery is operated, charged and stored in
an ambient temperature between 5°C (41°F) and
30°C (86°F); and discharges are equal to or lower
than 60% of the nominal C6 capacity. Operation of
the battery outside of the optimum temperature
range may require the use of a Wi-iQ
®
device
and NexSys
®
+ charger for proper temperature-
adjusted charging. The acceptable ambient
operating temperature range for the discharge of
NexSys
®
TPPL batteries is between -29°C (-20°F)
and 45°C (113°F). The acceptable ambient charging
temperature range is between 0°C (32°F) and 45°C
(113°F). Consult an EnerSys
®
representative for the
proper equipment selection for your application.
The battery obtains its full capacity after about 3
charging and discharging cycles. The valves on the
top of the battery must not be sealed or covered
during storage or operation. Electrical connections
(i.e. plugs) must only be made or broken while
the battery is in the open circuit condition (not
charging or discharging).
Discharging
Discharges over 60% DOD of the rated capacity
are categorized as deep discharges and are
not acceptable as they reduce the life of the
battery. Discharged batteries MUST be recharged
immediately and MUST not be left in a discharged
condition. The cycle life of the battery will depend
on the DOD; the higher the average DOD, the
shorter the cycle life.
Partially discharged and fully discharged batteries
can freeze, which irreversibly damages the battery.
Limit the discharge to a maximum of 60% DOD in
cold climates, and recharge immediately.
The battery may be fitted with a Protection from
Over-Discharge™ (POD™) device to provide
visual and audible warning signals. An observed
warning signal indicates the battery has reached
its maximum discharge level and must be charged
immediately.
The following load cut-off settings must be used :
• 50% DOD at an average loaded voltage of 1.98
volts per cell, or
• 60% DOD at an average loaded voltage of 1.96
volts per cell
when discharged at average loads with currents in
the range of I4 to I8. At average currents outside
of this range, please seek advice from an EnerSys
representative for energy cut-off settings.
7
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