Hitachi 3090 G2 Hardware Reference Manual page 35

If a server is left powered off, the battery will discharge slowly. This means that, when
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the server is powered up, the battery will take up to a certain number of hours to
reach full capacity and the time depends upon whether a conditioning cycle is started.
The scenarios are:
24 hours if a conditioning cycle is started
●
3 hours if a conditioning cycle is not started
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During the time it takes for the battery pack to become fully charged, the full 72 hours
of NVRAM content protection cannot be guaranteed. The actual amount of time that
the NVRAM content is protected depends on the charge level of the battery pack.
A battery pack may become fully discharged because of improper shutdown, a power
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outage that lasts longer than 72 hours, or if a server is left unpowered for a long
period of time.
If the battery pack is fully discharged:
The battery pack may permanently lose some long term capacity.
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Assuming a battery conditioning cycle is not started, a fully discharged battery
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pack takes up to 3 hours before it is fully charged. If a battery conditioning cycle is
started, a fully discharged battery pack takes up to 24 hours before it is fully
charged.
A battery conditioning cycle is started if the server is powered down for longer
●
than three months.
A battery pack may be stored outside of the server for up to one year before it must
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be charged and/or conditioned. After one year without being charged and possibly
conditioned, the battery capacity may be permanently reduced.
If you store battery packs for more than one year, contact your representative to find
out about conditioning your battery packs.
When preparing a server for shipment, if the NVRAM is still being backed up by
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battery (indicated by the flashing NVRAM LED), the battery can be manually isolated
using the reset button. See
reset button.
When preparing a server for shipment or if it will be powered down for any length of
time, it is important that the server has been shut down correctly before powering-
off. Otherwise, if the server is improperly shut down, the batteries supplying the
NVRAM will become fully discharged. This also occurs if the system is powered down
for too long without following the proper shutdown procedure.
Note: If the batteries become fully discharged, or the system is to be
powered down for an extended period, see
shipment or storage (on page 73)
information about recharging batteries.
To replace the NVRAM battery backup pack, see
pack (on page 54) .
Chapter 5: Hitachi NAS Platform server components
Hitachi NAS Platform 3080 and 3090 G2 Hardware Reference
Reset button (RST) (on page 42)
. Contact customer support for
Replacing the NVRAM backup battery
NVRAM backup battery pack
for the location of the
Powering down the server for
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