40A 12V Compared with original battery charger, the has features as follow: Variety of rare earth element have been added to the internal grids, which will result in a 25% rise in service life. The laminated sealing tech will 100% insulate acid leakage of batteries and effectively prevent the acid fog from polluting environment. The high equality of internal resistance greatly improves the homogeneity of storage batteries in use. It uses the advanced soft switch technology, with small size, high conversion efficiency, running full loading for a long time, stable output current, high reliability, long service life, easy operation,etc. With short-circuited protection, low-voltage protection, over-heated protection. High performance and good stableness. Suitable for inverter battery for charging