This is the 10878th most frequent Russian word.
выпадают
"Выпадают" means "fall out" or "drop out."
The word 'выпадают' here is used to describe leaves falling off from trees, representing a natural detachment.
Осенью листья выпадают с деревьев.
In autumn, leaves fall off trees.
The word 'выпадают' in this context means the loss of hair, which implies hair detachment from the scalp.
Из-за стресса у него выпадают волосы.
Due to stress, he loses hair.
Here, 'выпадают' refers to objects, batteries in this case, accidentally falling out of their compartment.