Owen, from Portsmouth, said the idea was a foolproof way of staying green as the onion decomposes and the drink bottle can be recycled once finished with.
Phil Stubbles, a physics lecturer from St Vincent College in Gosport, Hampshire, said almost all vegetables could power iPods because they contain ions which react with energy drinks to create a charge.
'The only problem is you have no control over how long it may work for ... and it can be smelly,' he added.
Has anyone here every tried this type of battery? Link -Thanks, Allison!