Power routing for helmet camera

[Albigularis]

So I'm fed up of always having to charge my helmet camera, so I'm planning to fit a relay to the bikes battery and then have power for a Sat Nav going up to near the clocks, and then have another power cable onto the relay, for the camera.

I don't want it up at the clocks, because it'll end up swaying around scratching the paint on the tank. Likewise I don't want to step off the bike forgetting it's there and accidentally pulling the camera off my helmet. I do need it to be somewhat weatherproof as well, but I think that can be sorted quite easily.

Has anyone done this? If so, where did you route the cable to?
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Biking history so far-
Aprilia RS125 - Kawasaki ZXR400 - Triumph Street Triple R - Suzuki GSXR1000 L3 - BMW R1200GS - Kawasaki Z1000 - Kawasaki ZX10R C1H - Ducati Multistrada 1200 S Touring - Suzuki Hayabusa

[Iain.]

Had the charger under the seat.

When off the bike I simply put the camera on charge, figured it wasnt going to suck that much power. Worked great, when I got back to the bike I swapped my phone over and put that on charge whilst I used the camera.

[Albigularis]

[Rogerborg]

Huh. I'd assumed that someone would be selling a universal magnetically coupled USB cable, but no luck. They're all device specific (Sony Xperia, Pebble watches). Seems like a gap in the market.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Albigularis]

[Rogerborg]

Nice one, that looks great.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[talkToTheHat]

You can get two pole magnetic couplings off of eBay. Use to make connections between +5v and GND connections of your USB. Try cutting up a USB A extension cable?

Edit: called MagCode, is expensive though.
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Bandit. does. everything.

[Rogerborg]

[rideslikean00...]

I'll be looking into a front mounted camera soon, can it be powered from the bike in such a way that it only works when the key is in? So it's not sapping the battery when it's off, although presumably it's not gonna be using a lot of power either way.
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Previous/Current Bikes
2013 Yamaha YBR-125ED -> 1997 Yamaha YZF-1000R Thunderace -> 2009 Yamaha XJ-6 Diversion -> 2007 Yamaha FZ6 Fazer S2

[Albigularis]