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Appendix A. Raid Battery Card Assembly; Specifications; Battery Life And Data Retention Time - Lenovo ThinkServer TD230 Hardware Maintenance Manual

Machine types: 1027, 1029, 1039, and 1040.
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Appendix A. RAID battery card assembly


The following table provides specifications of the ThinkServer 8708EM2 RAID Battery.
Battery technology
Battery operating temperature (ambient)
Humidity (storage and operating)
Battery storage temperature
Battery voltage conditioning
Fast charge rate
Battery pack
Battery capacity
Charge circuitry card
Battery charge time
Auxiliary power

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
ThinkServer 8708EM2 RAID Battery (iBBU06)
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
© Copyright Lenovo 2010, 2011
10 to 40°C (50 to 104°F)
20%-80% (non-condensing) (ThinkServer 8708EM2 RAID
• < 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)
<3.7 V
500 mAh
1 cell
2.61 inches x 2.122 inches
700 mAh
4 hours
Data retention time
72 hours for 256 Mbytes, using three 64 Mx16 DDR2
DRAMs (low power)


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