1827420 is the model number for a Friwo electronic battery charger, specifically designed for maintenance charging of lead acid batteries (leisure, motorcycle and industry batteries). It comes with six pre-programmed charging profiles, to suit a variety of battery types, and is equipped with a range of protective measures for the safecharging of batteries. It also has reverse polarity protection, over- temperature protection and overcharge protection, as well as rapid charging modes for quick recharging of batteries, and a separate charging indicator for each port, to keep track of the charging process.