HiTec 44167 X4 AC Plus 4-Port AC/DC Multi-Charger Reduces charging time, but does not balance the cells, this mode only charges the battery to approximately 90% capacity Input Requirements: 100-120V AC or 12 - 15 Volts DC, 20 Amp Minimum Monitors individual cell voltage, keeping the cells within an acceptable voltage range and charges the pack to peak capacity Used for long-term battery storage Adjusts the voltage level so the battery will not be damaged during long term storage