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The charger I'm using has a 3 volt or 12 volt option; I'm using the 12 volt option. I don't have a 12 volt battery but I don't believe the charger would provide less juice then a 12v battery on the 12v option.
I don't have the plug that can plug in to the cigarette lighter, and in all of this, no alarm went off, so I'm not sure about the alarm you're speaking of.
I'd still like to explore the emergency cable option but can't seem to find any specific directions on it.
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