Keep your batteries charged and ready to go with the NOCO GENIUS2X4 Smart Battery Charger/Maintainer/Desulfator. This powerful battery charger/maintainer provides a quick and efficient charge for all lithium-ion, 6V and 12V lead-acid batteries. This compact charger performs in all kinds of temperatures. It features auto-memory to automatically return to the last selected mode and multi-bank functionality to charge four batteries simultaneously. With multiple charge modes, advanced diagnostics, and a clear display that monitors charge levels, this charger is the ideal way to keep your marine batteries in top working condition.