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The Battery Tender Junior is much more than a trickle charger. It has a brain. It’s lightweight compact and fully automatic; very easy to use especially in small spaces. It will keep your battery fully charged so that it is ready to go when you are Features Perfect for all lead-acid flooded or sealed maintenance free batteries AGM and gel cell. Complete 4-step charging program Initialization Bulk Charge Absorption Mode Float Mode. Automatically switches to float / maintenance voltage after fully charging the battery. If the battery voltage drops too far under load full charger output power resumes. Solid state two color LED indicates stage of charger. Spark proof.