IBM X23 - Manual (Page 64)

1030 Backup battery
v Battery pack (1010)
v DIMM (1020)
CAUTION:
The backup battery is a lithium battery and can cause
a fire, an explosion, or severe burns. Do not recharge
it, remove its polarized connector, disassemble it, heat
it above 100°C (212°F), incinerate it, or expose its cell
contents to water. Dispose of the battery as required
by local ordinances or regulations. The use of an
incorrect battery can result in ignition or explosion of
the battery.
60 ThinkPad X20, X21, X22, X23, X24