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Notice on disconnecting the cable from flip-lock ZIF connector:
Some cables used in ThinkPad T420s and T420si models are connected to flip-lock ZIF connectors.
When disconnecting a cable from the flip-lock ZIF connector, do as shown in this figure.
1
2
1010 Battery pack
Important notice for replacing a battery pack:
Lenovo ThinkVantage Toolbox (in Windows 7) and Lenovo System Toolbox (in Windows Vista and Windows
XP) have 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 or Lenovo System Toolbox is not installed in the computer, the customer
should download this program before a non-physically damaged battery pack is replaced. Note that a
physically damaged battery pack is a non-warranty replacement part.
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Hardware Maintenance Manual
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