environmental
ac
accessory
adapter
background
battery
box
cells
charge
charger
clipped
closeup
contacts
dc
device
discharge
efficiency
electric
electrical
electricity
electronic
energy
equipment
four
indicator
input
isolated
led
mobile
objects
phone
plug
plus
polarity
positive
power
protection
recharge
rechargeable
recheargable
silver
supply
technic
technology
tool
use
volt
voltage
white