IBM ThinkPad 340 Series Hardware Maintenance Manual page 438

1020 Battery Pack
Notes:
1. Be careful that the computer does not fall backward
when the battery pack is removed.
2. When replacing the battery pack, check that the
storage switch of the new battery is set to the on (|)
position. Do not operate the storage switch of a
battery that has been used and is going to be
re-used.
3. Check that the keyboard latch springs are in place.
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IBM Mobile Systems HMM