When I replaced the lighting set battery (see here), I had to figure out a method of connecting it to the light set without having to butcher the connector on the lights. As I saw it, it had two options; try and find a mating part, or fit a new one to the light set. I didn't like the latter, as it would mean destroying the waterproofing. Studying the connector, I found it looked like it might fit a barrel socket - the kind that are used on battery eliminators for low power equipment.
Rooting around on an electronic components stall at a radio rally, I found a variety of inline barrel sockets available for the princely sum of 50p each, so I bought a handful of different sizes and took them home to try them out.
A 2.5mm barrel socket fitted well, the only problem being the need to shorten the rubber sheath on the plug on the light set as it obstructed the mating socket. Using a length of 2 core 1mm mains flex, I soldered a lead up and terminated it in a couple of 0.25" blade receptacles to match the battery terminals. I then used cable ties to fix the lead to the frame of the bike.
The last part of the job involved fitting a similar 2.5mm barrel plug to the lead acid charger, thus enabling easy connection of the charger to the battery without having to fret about getting the right polarity. To charge the lights when I come in I merely unplug the lights, plug the charger into the lighting connector, and plug the charger into a 13A socket. A quick, neat, easy solution!
