Soldering isn't a problem. As you can guess from my username I'm more into model trains, where engine repairs are also quite difficult sometimes. I at least feel more confident about the problem so that'll be okay.
The cam is meant to be used on a model locomotive incidentally, with a battery pack in the tender or carriage behind it. That way i can hopefully turn on the cam and let it run all day instead of stopping it every time i need to restart the cam