Abstract: An energy-conserving charger controller system, including charge sensing circuitry and operational algorithm, reduces parasitic lost energy by automatically “learning” the unique charging signature of a consumer electronic device (CED) battery to determine and sense when a it is being charged or not, and implementing conversion (from mains AC to DC) to occur only when a device needs charge. The inventive system employs a current measurement circuit, a microprocessor controller including a timing circuit and control algorithm code structure, a TRIAC current switch and an on-board battery. The inventive system and method is universal, being independent of the charger design, and may be an independent device upstream of the charger (between it and the mains power supply), integrated with an AC adapter charger unit, integrated into a CED, or part of a power strip for individually and independently controlling each AC adapter plugged into the strip.