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Appendix A. RAID battery card assembly
Specications
The following table provides specications of the ThinkServer 8708EM2 RAID Battery.
Battery technology
LiON
Battery operating temperature (ambient) 10 to 40°C (50 to 104°F)
Humidity (storage and operating) 20%-80% (non-condensing) (ThinkServer 8708EM2 RAID
Battery)
Battery storage temperature
• < 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 2.61 inches x 2.122 inches
Battery capacity 700 mAh
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 8708EM2 RAID Battery (iBBU06)
72 hours for 256 Mbytes, using three 64 Mx16 DDR2
DRAMs (low power)
The data retention time varies according to the following:
• Capacity of the battery pack and the battery load
• Ambient temperature
• Age of the battery
• Numbers of discharge cycles the battery has been through
• DRAM (dynamic random access memory) size
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