IBM manual a b

Holding the battery release lever in the unlocked position
2, remove the battery pack 3.
2
3
When installing: Install the battery pack along the slide
rails on the left and right sides of the
battery-pack slot. Then make sure that
both battery latches, a and b, are
locked, as in the following figure.
a
b
Removing and replacing a FRU
ThinkPad T40/T40p, T41/T41p, T42/T42p Series 73