Lenovo T420 - Manual (Page 69)

1010 Battery pack
Important notice for replacing a battery pack:
Lenovo ThinkVantage Toolbox (in Windows 7) has an automatic battery diagnostic that determines if the
battery pack is defective. A battery pack FRU should not be replaced unless this diagnostic shows that
the battery is defective.
The only exception to this is if the battery pack is physically damaged or a customer is reporting a possible
safety issue.
If Lenovo ThinkVantage Toolbox is not installed in the computer, the customer should download this program
before a non-physically damaged battery pack is replaced. Note that the replacement of a physically
damaged battery pack is not covered by the warranty.
Removal steps of battery pack
DANGER
Use only the battery specified in the parts list for your computer. Any other battery could ignite
or explode.
Unlock the battery latch 1 . Holding the battery latch in the unlocked position 2 , remove the battery pack in
the direction shown by arrow 3 .
3
2 1
When installing: Install the battery pack in the slot. Make sure that the battery latch is in the locked position.
Chapter 8 . Removing and replacing a FRU 63