As soon as the charging end voltage is reached, the electronic control automatically reduces the charging current. This allows the chargers to remain connected to the battery for an unlimited time (hibernation). Ideally suited for charging or buffering lead batteries for cars, motorhomes, motorcycles, boats - especially if the batteries are to be kept fresh for a longer period of time.Tip: Also charge your model lead batteries with these plug-in chargers. With practical battery terminals. I-U charging method.