Eneloop Pro Smart Charger with LCD Display is ideal for the professional user who wants to charge, maintain and test their batteries. The microprocessor-controlled charger features single bay monitoring and checks and charges each cell separately. It charges 1-4 AA (Mignon) or AAA (Micro) size Ni-MH batteries as well as mobile devices via USB output. Smart Charge & DeltaV Protection: For particularly smooth charging, the fast charger is equipped with high-quality overload protection. Each cell charges individually and automatically completes charging before an overload occurs. The illuminated LCD display shows many information about capacitance (mAh), voltage (V), energy (Wh), duration or charge status for each cell individually. In Refresh mode, "tired" batteries are refreshed (with indicating the current capacity "again" in the battery). The charger also notifies the user when a battery needs to be replaced.