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The Guardian - UK
The Guardian - UK
Lifestyle

How has my sports watch kept going for 25 years without a battery change?

Casio digital watch
Keep on running ... Photograph: Richard Sheppard/Stockimo/Alamy Photograph: Richard Sheppard/Stockimo/Alamy Stock Photo

I’ve had a digital sports watch for about 25 years. It continues to work well (apart from the nightlight) yet I’ve no recollection of ever renewing the battery. Has it got the world’s finest battery, or is it secretly sapping my body’s energy?

Roger Driscoll, Epping

Post your answers – and new questions – below or email them to nq@theguardian.com

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