The Nitecore I4 automatically selects the appropriate amount of current and voltage based on battery type and capacity, but you can also use the V button to set charging voltage in each slot independently (use this feature to charge 3.7V and 4.35V batteries). The C button allows you to assign the full 1500mAh output to an individual high-capacity battery, such as an 18650 or 26650, for fast charging. Once a given battery is fully charged, the New i4 diverts its power to other cells in the charger, speeding up their charge times, a feature known as Active Current Distribution. Unlike many chargers, this unit is capable of reviving most depleted IMR batteries, and monitors their charging closely to prevent safety hazards from overcharging.
The MIBOXER C4-12 has different charging features and modes according to different type battery charging. It comes with standard Li-ion battery charging mode when work with Li-ion/IMR/INR/ICR batteries and uses a full charge mode for Ni-MH, Ni-Cd batteries charging process.