Thanks for the long response.
I would not be able to solder, since my accident my hands are not very steady.
I want to get the battery pack working again so I can kayak more often.
I shall have a search on the net for any battery places that could refurb it and what cost it would be compared to purchasing a new one using parcel forwarding.
Does anyone know an honest battery place that would refurb it?
With you saying they could potentially be revived I would be concerned someone would revive them and charge me for new batteries.