I haven't just hooked them up and left them.... it'd be fine, but I don't think it'll actually charge very much. I've certainly hooked up a car to a dead flat battery that won't even allow a jump start, and left them hooked up while revving the car for 15 or 20 mins to get a charge into the bike battery. They don't transfer much at idle, unfortunately, as the alternator isn't doing much.
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