I think that figure includes a full service and repair to the power supply circuitry as
@elviscaprice had broken something in his failed attempt at swapping the batteries.
A simple battery swap carried out by your retailer or local electronics engineer (basically someone who can solder without frying things!) should work out less than £25
Hats off to John for for resolving the issue in such a generous manner...
The quoted price included "If you want to replace it, that would be a chargeable service. The cost is £210, plus service charge £37.50, plus shipping (depends on address)."
A lot probably depends on who performs the servicing/replacement.
Chord have previously quoted a price in the mid £30s for the battery itself, so I assume that is what the £37.50 refers to.
Shipping will vary with each Hugo.
For the physical act of replacing the battery, I imagine that the technicians at Chord, who must be assembling Hugos every day, and know the device inside out, would be able to take the back off, unsolder the battery, replace/resolder the battery, then reassemble the Hugo, could do all that in 5 minutes. Time would get added on if they needed to do a thorough testing, plus if the hugo needed to be carefully repackaged etc. However i would not have thought the overall cost need be excessive.
Things are a bit different if all of this is performed by a local electronics engineer, many thousands of miles away from the UK, especially if this person has never seen a Hugo before. Not only will they take longer to perform the replacement, but they will add in time to research exactly what they need to do with the Hugo. So the time taken will be much longer, and much costlier.
@Mojo ideas has made a very generous offer to
@elviscaprice so I hope that this gets sorted out to everyones satisfaction quickly.