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I used two of these, 'permanently' stuck into the D1:
http://www.ebay.co.uk/itm/12cm-Very-Short-USB-2-0-High-Speed-Cable-EXTENSION-Lead-A-Male-Plug-to-Female-/400708565329?hash=item5d4c177951:g:7wYAAOSwnNBXZ8RWIf the connectors on their ends die, I can rip them out and replace them. This leaves the D1 connectors rust free and any wear-and-tear happens to the cheap cables. It also makes plugging stuff in easier because my D1 is fixed in an odd spot.
You could do the same thing with longer USB cables of the same variety and then leave whatever item you are charging in a waterproof bag. The D1 needs to be in the open air though, for heat um release whatchamacallit.
Where do you work @Chak ? My ultra bike is up and running again but if you're nearby I could do with other handy wrenching peeps.
Replaceable, but a hassle to do so depending on how you feel about glue guns and soldering irons.
@gillies The two guys I installed for are both heading to TCR, so want absolute reliability or as close to. Only one's stopped charging so far after two 300k rides, so not sure what the issue might be, I was willing to investigate, but the guy decided to send back to Igaro.
The USB connector had a fair bit of rust, but I wouldn't have thought this would have been an issue electrically. I would personally try any options to help (paging @hippy for his idea). Simplest would be to leave the USB end in a TT mounted feedbag and use when needed.