background
battery
camera
capacity
cell
charge
charger
chemical
collection
conservation
electricity
electronic
energy
equipment
fuel
future
group
handphone
industrial
industry
ion
isolated
lithium
macro
metal
minus
mobile
mobility
modern
old
pack
phone
plastic
plus
polarity
poles
power
recharge
rechargeable
recycle
recycling
start
supply
symbol
technology
telephone
voltage
volts
watt
wattage