Hydrogen fuel cells
Cold fusion
Clockwork
Solar power
Hamster power
Regenerative charging from jaw movement when you talk on the phone
Pezio charging from shoe soles
Potato or lemon + zink
...
Just sayin'
Hydrogen fuel cells
Cold fusion
Clockwork
Solar power
Hamster power
Regenerative charging from jaw movement when you talk on the phone
Pezio charging from shoe soles
Potato or lemon + zink
...
Just sayin'