电量表
diàn​liàng​biǎo

battery indicator

电量表 (電量表) diàn​liàng​biǎo
battery indicator noun
a gauge or display showing the amount of remaining charge in a battery
coulometer
a scientific instrument used for measuring electric charge or quantity of electricity
power meter noun
an instrument used to measure the total amount of electricity consumed by a building or circuit

Sources
Definitions
CC-CEDICT