You don't say what charger you have. It needs to be AGM compatible. I recommend you go to the auto parts store and buy a batter "maintainer". I have a Schumacher one that costs about $37 and you can leave it on for as long as you want - months if you are not using the car. . A maintainer shuts itself off and only comes back on if the battery drops. Just leave it on overnight. The one I have looks big in the online picture, but is about the size of a couple packs of cigarettes.
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