accumulator
adult
alkaline
appliance
background
battery
cell
charge
closeup
concept
conservation
current
eco
ecological
ecology
energy
environment
environmental
hand
heap
hold
holding
human
industry
isolated
lithium
male
man
many
metal
metallic
minus
object
one
part
people
person
pile
plus
power
recharge
rechargeable
recycle
recycling
renewable
reuse
shape