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Charger automatically switches to Float Mode when fully charged. Absolutely no danger of overheating or overcharging. Leave it connected for months at a time if necessary. Designed to charge AGM, sealed maintenance free, lead calcium and flooded batteries. Manufacturer recommends checking battery fluid monthly. 4-step charging (Initialization, bulk charge, absorption mode, float/maintenance). Spark Proof Temperature compensated Short circuit and reverse polarity protected. 10-year manufacturers warranty.