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I have one, though not from GM or anything.
Just be aware that AGM batteries are fully charged at a slightly lower voltage than regular lead acid batteries and that the charger has to be aware of AGM chemistry, or you should use the cold-temp setting on your charger. If it doesn't have any such option, I wouldn't use it unless it was only for AGM batteries or you risk either overcharging your battery or overheating it. AGM batteries are very sensitive to heat and charging too fast (not a problem with trickle charging) may cause it to charge too hot (50C is the max core temp before damage starts occuring).
in other words, dont cheap out with a plain old trickle charger or you could damage the battery, especially for those who either leave it plugged in for days on end or are charging a dead battery.
Edit,. I wouldn't go more than 4 days without running the car. I think a week is pushing it depending on outside temps
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