Lenovo ThinkServer RD230 - Manual (Page 112)

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 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)
ThinkServer 8708EM2 SAS RAID Controller Battery
(iBBU06) 72 hours for 256 Mbytes, using three 64 Mx16 DDR2
DRAMs (low power)
ThinkServer RAID 700 Adapter Battery (iBBU08) 72 hours for 512 Mbytes, using five 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
100 ThinkServer User Guide