Lenovo ThinkPad T420 Hardware Maintenance Manual - Page 73
Battery pack - unlock
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1010 Battery pack Important notice for replacing a battery pack: The Lenovo ThinkVantage Toolbox and Lenovo Solution Center (in Windows 7) have an automatic battery diagnostic component that determines if the battery pack is defective. A battery pack FRU should not be replaced unless this diagnostic test 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 . 1 2 3 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 67