accumulator
bars
batery
battery
black
blackout
capacitor
capacity
charge
conservation
consumption
device
discharge
discharging
efficient
electric
electrical
electricity
electronics
empty
energy
full
generation
gray
green
handheld
high
icon
indicator
level
load
low
meter
mobile
no
portable
power
recharge
rechargeable
red
set
sign
source
storage
supply
symbol
technology
voltage
yellow