This is the 2012th most frequent Portuguese word.
bateria
"Bateria" in Portuguese means "battery" (electrical energy storage device), "drum kit" (musical instrument), or "set/group" (e.g., a set of questions or tests).
Here, 'bateria' refers to the rechargeable energy-storing component of the cellphone.
Eu preciso carregar a bateria do meu celular.
I need to charge my cellphone's battery.
In this sentence, 'bateria' indicates the musical drum set played in a band or ensemble.
Ele toca bateria em uma banda de jazz.
He plays drums in a jazz band.
The term 'bateria' here signifies an artillery group or unit within the military context.