IBM B50 - Manual (Page 175)

Changing the Battery
CAUTION:
The lithium battery can cause fire, explosion, or a severe burn. Do not
recharge, disassemble, heat above 100°C (212°F), solder directly to the cell,
incinerate, or expose cell contents to water. Keep away from children.
Replace only with the part number specified for your system. Use of another
battery may present a risk of fire or explosion.
The battery connector is polarized; do not attempt to reverse polarity.
Dispose of the battery according to local regulations.
Attention: Removing the battery may erase the Power-on Password, the current
time and date, the customized boot list, and any other customized
configuration information. After changing the battery, you may have to reset
these values using the System Management Services and your operating
system.
Make sure that the power cable is disconnected from the server before changing the
battery.
Chapter 7. Removal and Replacement Procedures 7-31