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The same thing happened to me when mine broke. I robbed the parking brake return spring to substitute the throttle spring until I could get back to civilization. I used shoestring to keep the pads off of the brake in order to get back.
I've used JB weld for these types of repairs in the past. I have a radiator fixed with it that hasn't leaked for 6 years going. It may not be as good as solder, but it may be another choice.
I use a battery jumper cable to link each battery in parallel, then charge like you would any other 12v battery. To date, I have had great success with this method.