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@Bad_Science
The emergency thing is a car one, but it works fine.
The trickle charger looks like what you want, I have an Acumen one.
http://www.sportsbikeshop.co.uk/motorcycle_parts/content_prod/46983
There is a lead which fits on to the battery terminals and lives permanently on the bike under the seat. To attach the charger, you just pull this lead out and fit it to the charger.
Smart chargers are supposed to continually monitor the battery, so they stop putting power in once the battery is full. You can leave them connected and they won't hurt the battery.
Someone please feel free to jump in with some science and long words, but that's how I understand it.