Backup Battery
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.
Use of an incorrect battery can result in ignition or explosion of the battery.
Replacement batteries can be ordered from IBM or IBM Authorized Dealers.
Turn the computer upside down.
Step
Size (Quantity)
Torque
1
M2.5x7mm, black bind (1)
4kgcm
When re-installing: Make sure you use the correct screw,
and tighten it firmly to the torque shown in the table if you
have a torque screwdriver. Never use a screw that you removed. Use a new one. Make sure the screw is
tightened firmly (see 'Screw Tightening Information' if you do not have a torque screwdriver).
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.