Battery Life; Storing The System - Hitachi G1000 Hardware Manual

shipment, the batteries are disconnected automatically to prevent any
discharging during shipping and storage until the system is installed. During
installation, they are reconnected.
Note: When the system is running, it generates a SIM when the cache
backup batteries are not connected.

Battery life

The batteries have a lifespan of three years and hold a charge for some time
when disconnected. When the batteries are connected and power is on, they
are continuously charging. This occurs during both normal system operation
and while the system is in idle mode.
When the batteries are connected and the power is off, the batteries slowly
discharge. The batteries have a charge of less than 50% after two weeks
without power. When fully discharged, the batteries must be connected to
power for three hours to fully recharge.
Note: The storage system generates a SIM when the cache backup batteries
are not charged to at least 50%. The LEDs on the front panel of the cache
backup kits also show the status of the batteries.

Storing the system

While connected, the cache backup batteries will completely discharge in two
to three weeks without power applied. If you are not using the storage
system for two weeks or more, contact customer support to move the
batteries to an active storage system, or set the storage system to idle mode
for at least 3 hours once every two weeks.
If you store the system for more than two weeks without disconnecting the
cache backup batteries, the batteries need to charge for at least 90 minutes
when you restart the system before the cache can be protected. To prevent
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Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
Power on/off procedures