Lenovo ThinkServer RD230 Hardware Maintenance Manual page 142

The data retention time for the battery card assembly is as follows:
BBU name
ThinkServer 8708ELP SAS RAID Adapter Battery (iBBU05)
ThinkServer 8708EM2 SAS RAID Controller Battery
(iBBU06)
ThinkServer RAID 700 Battery (iBBU08)
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
130
ThinkServer RD230 Hardware Maintenance Manual
Data retention time
• 72 hours for 256 Mbytes, using five 32 Mx16 double
data rate two dynamic random access memory
modules (DDR2 DRAMs) (low power)
• 72 hours for 256 Mbytes, using three 64 Mx16 DDR2
DRAMs (low power)
72 hours for 256 Mbytes, using three 64 Mx16 DDR2
DRAMs (low power)
72 hours for 512 Mbytes, using five 64 Mx16 DDR2
DRAMs (low power)