Most adults replace watch batteries themselves or at convenience stores. Both options often damage the water resistance seal that quality watches depend on for longevity. Professional jeweller service (£10-25) preserves the seal.
Why this matters
Once water resistance is compromised, the watch is increasingly vulnerable. Moisture damages movement gradually. Quality watch becomes disposable.
For watches over £200, always use professional service. Local jewellers handle most brands. The few extra pounds preserve significant value.