This intelligent charger has four independent charging slots to charge any combination of Ni-MH, Ni-Cd, Li-ion, or LiFePO4 cells at the same time. The microprocessor monitors each battery and provides a safe and effective charge using precise Pulse Width Modulation (PWM) technology. A single Li-ion or LiFePO4 cell can also be fast charged at up to 2A. The high contrast LCD screen provides real-time battery monitoring, including charging current (A), charging capacity (mAh), voltage (V) and battery power (%). Features include alarm and error messages for bad batteries, reverse polarity protection, short circuit, over-charge, and over-temperature. Power comes from an available USB port using the supplied USB Type-C power cable. Microprocessor to Monitor Each Battery Pulse Width Modulation (PWM) Technology Powered by USB Type C Cable Suits Ni-MH, N-Cd, Li-ion LiFePO4 Intelligent fast charging up to 2A Independent charging slots LCD screen