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Appendix A. RAID battery card assembly
Specications
The following table provides specications of the RAID battery card assembly.
Battery technology
LiON
Battery operating temperature (ambient) 10 to 45°C (50 to 113°F)
Humidity (storage and operating) 20%-80% (non-condensing)
Battery storage temperature
Depends on storage time, as follows:
• < 30 days: 0 to 50°C (32 to 122°F)
• 30–90 days: 0 to 40°C (32 to 104°F)
• > 90 days: 0 to 30°C (32 to 86°F)
Battery voltage conditioning <3.7 V
Fast charge rate 500 mAh
Battery pack 1 cell
Mechanical
3.595 inches x 2.055 inches (8708ELP SAS RAID Controller
battery)
2.61 inches x 2.122 inches (8708EM2 SAS RAID Controller
Battery)
Battery capacity
1350 mAh (8708ELP SAS RAID Controller battery)
700 mAh (8708EM2 SAS RAID Controller Battery)
Charge circuitry card
Yes
Battery charge time 4 hours
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 rst.
The data retention time for the battery card assembly is as follows:
BBU name Data retention time
ThinkServer 8708ELP SAS RAID Adapter Battery (iBBU05)
• 72 hours for 256 Mbytes, using ve 32Mx16 parts
DDR2 (double-data-rate two) (low power)
• 72 hours for 256 Mbytes, using three 64Mx16 parts
DDR2 (low power)
ThinkServer 8708EM2 SAS RAID Controller Battery
72 hours for 256 Mbytes, using three 64 Mx16 DDR2
parts (low power)
The data retention time varies according to the following:
• Capacity of the battery pack and the battery load
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