12V 6A battery charger for car with pulse repair low noise fan1、In winter, cold weather and low temperature will cause large internal resistance and low voltage of batteries. If the normal voltage is insufficient, the charging voltage will be automatically increased. 2、In summer, the temperature is hot, the battery voltage rises, and the normal voltage charging is easy to cause overcharge, which is harmful to the battery. In summer mode, the charger will reduce the charging voltage, so that your battery will not overcharge. 3、High and low frequency pulse repair technology, has a good repair and activation effect for undervoltage batteries, batteries that have been idle for a long time, and batteries that can not be filled, so that your batteries will be refreshed. 4、Can insure stable current transmission, long‑term charging of the wire is not hot, very safe. 5、Suitable for dry batteries, wet batteries, maintenance‑free batteries,and most types of lead acid batteries including Calcium, GEL and AGM, EFB, etc.(lithium batteries are not allowed).