This is the 3462nd most frequent Portuguese word.
morre
"Dies."
Here, 'morre' is used figuratively to express an intense emotional feeling.
Ele morre de saudades da sua família.
He misses his family deeply.
In this sentence, 'morre' refers to the literal ceasing of life of the plant.
A planta morre sem água.
The plant dies without water.
The word 'morre' is applied metaphorically to indicate the battery losing its functionality.