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are these carb or efi machines? cold shouldnt be an issue with either but it will help troubleshoot your problem.what kind of batteries do you have on them? I wouldnt use anything but a good AGM battery. The new AGM batteries are great but the biggest problem with them is recharging them. If the charging voltage is too high, over 14 to 14.5 volts, it will fry the battery. The battery should be charged at a rate of .75 to 1.5 amps on an auto shut off battery charger. Put it on a charger and charge it too fast and it will ruin the battery.