The IMPRES smart energy system in this six-unit charger ensures maximum talk-time and optimum battery life for your radio. Using advanced charging algorithms, this system automatically reconditions IMPRES batteries based on actual usage, keeping them in peak condition. You can safely leave batteries on the charger for extended periods without subjecting them to heat damage. In addition, the display module provides powerful, real-time information including charge status, battery mAh, voltage, and time remaining for a complete charge. This 110-volt, rapid-rate charger works on NiCd, NiMH and Lithium-ion batteries, and it is compatible with some non-IMPRES batteries.