>>Before I realised there were no other navlights, I'd removed and binned the all round white because I needed the power source for my electric toaster.<<
Have you considered putting one of Honda's lighweight generators in your grab-bag? Powering your toaster isn't exactly essential IMO though I do understand where you are coming from.
I think you should consider putting an electric watermaker in your grab bag which would be useful for personal hygiene, especially when you are sharing your raft with several other shipmates.