accumulator
acid
auto
background
backup
battery
black
cable
closeup
connection
conservation
eco
electric
electrical
electricity
emergency
energy
equipment
generation
generic
hardware
industrial
isolated
maintenance
metal
object
old
peg
peripheral
plastic
plug
portable
power
protected
push
red
safety
sealed
sign
source
supply
support
technology
unit
up
volt
voltage
warning
white
workshop