This report featured on BBC Health Check, available in the UK on BBC iPlayer.

SÃO PAULO — Only around 10 percent of people around the world’s 640 million people with hearing loss have access to hearing aids, which can be prohibitively expensive.

For many, even if they get their hands on a hearing aid, the batteries powering them can be even more of an issue: not readily available or too expensive, and after a single use they have to be throw away.

But one Brazil-based company has come up with a cheaper and more sustainable solution – and is also putting its profits into stopping preventable hearing loss.

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