The universal charger with individually selectable charging programs for every battery: it charges, discharges, revitalizes older or long-stored batteries, and tests the capacity of your batteries. After charging, the batteries can remain in the device for maintenance charging. This charger can charge batteries with the maximum possible capacity. It can accommodate 1-4 AA/Micro batteries, mixed NiMH/NiCD, and features automatic type detection. The device automatically switches to maintenance charging after the charging process is complete.