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Appendix A. RAID battery card assembly
Specifications
The following table provides specifications of the RAID battery card assembly.
Battery technology LiON
Battery operating temperature (ambient)
v Charge: 10-45°C
v Discharge: 10-60°C
Humidity (storage and operating) 20%-80% (non-condensing)
Battery storage temperature Depends on storage time, as follows:
v < 30 days: 0–50°C
v 30–90 days: 0–40°C
v > 90 days: 0–30°C
Battery voltage conditioning <3.7 V
Fast charge rate 500 mAh
Battery pack 1 cell
Mechanical 3.595 inches X 2.055 inches
Battery capacity 1350 mAh
Charge circuitry card Yes
Battery charge time 4 hours
Cache memory size supported Refer to the ThinkServer 8708ELP SAS RAID
adapter
Memory bus speed Refer to the ThinkServer 8708ELP SAS RAID
adapter
Memory bus width Maximum 72-bit
Error correcting capability (ECC) Not applicable
Auxiliary power Yes
Battery life and data retention time
This sections includes information about the battery life and data retention time.
It is recommended that you replace the battery pack on the battery card assembly
once a year or after 500 recharging cycles, whichever comes first.
The data retention time for the battery card assembly is as follows:
BBU name Data retention time
ThinkServer 8708ELP SAS RAID Adapter
Battery (iBBU05)
v 72 hours for 256 Mbytes, using five
32Mx16 parts DDR2 (double-data-rate
two) (low power)
v 72 hours for 256 Mbytes, using three
64Mx16 parts DDR2 (low power)
Note: The data retention time varies according to the following:
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