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The battery on my two year old Garmin Forerunner 305 failed to re-charge. It was then that I realised that the watch is a sealed unit. After seeking information on the internet on how to replace the battery ( the tool kit required includes a soldering iron, which I don't have, then you have to find a battery that fits), I finally rang Garmin on 0808 238 0000 in order to resolve the issue. (It's a freephone number).
Garmin immediately offered to replace the watch unit with a new one at a cost £58.80p. They required a credit card number and then they would e-mail me an address in Southampton to which I should send the watch. I decided that this was the most cost effective way of getting my Garmin 305 either repaired or replaced.
I appreciate that £58 is a lot of money to pay for what amounts to a failed re-chargeable battery. I have had training watches from other manufacturers and personally found that the Garmin 305 was best suited to my needs.
For me, therefore, this seemed like the cheapest option open to me to get a training watch of the same standard. (A new Garmin 305 is selling on Amazon for £289 (£133 for a used one) at time of this post)).
I hope this information is of use in the event that others have the same problem in the future.