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I'd also suggest a cheapie multimeter, a little digital autoranging meter is plenty. Makes troubleshooting electrical gremlins a lot easier.
Also, you're on a motorcycle. It's a big fancy generator... use your riding time to charge up your gear. 12v to USB chargers aren't too difficult to come by.
Another +1 for ADV, lots of moto-photogs there. You've got some great shots.