Lenovo ThinkServer RD240 Hardware Maintenance Manual page 73

Notes:
a. The battery card assembly protects the integrity of the cached data on the RAID controller by
providing backup power up to 72 hours in the case of a complete ac power failure or a brief power
outage. It has built-in functionality to charge the battery pack automatically and to communicate
battery status information such as voltage, temperature, and current to your server. It also provides
an inexpensive alternative to using an uninterruptible power supply, and a second level of fault
tolerance when used in conjunction with an uninterruptible power supply. For more information about
the battery card assembly, see Appendix A "RAID battery card assembly" on page 131.
b. The battery card assembly option kit contains a user guide, the battery card assembly, and three
Phillips-head screws. Do not remove the battery card assembly from the antistatic shipping
container until you are ready to install it. When you remove the battery card assembly from your
server, place it in its original container.
c. Check the appropriate support Web sites for the latest updates for your basic input/output system
(BIOS) code, utility programs, device drivers, and other software applications. Follow the instructions
provided by your Service Provider to download and install updates.
d. It is recommended that you replace the battery pack on the battery card assembly annually or after
500 recharging cycles, whichever comes first.
e. The temperature of the battery card assembly is generally 15–20 degrees higher than the ambient
temperature during fast charge. Therefore, to complete fast charge cycle, the ambient temperature
should be less than 45 degrees. If the ambient temperature exceeds 45 degrees, the fast charge
cycle will terminate prematurely, thus preventing the battery card assembly from reaching a fully
charged state.
Attention:
• When attaching the battery card assembly to a PCI Express slot, center the Phillips-head screw
driver to avoid damaging the screw head and do not over-tighten the screws as you might damage
the battery card assembly.
• The battery in the battery card assembly must recharge for at least six hours during fast charge
under normal operating conditions.
.
Chapter 7 Installing, removing, or replacing hardware
61