Battery Charger and Discharger Using USB Power Supply

Circuit DiagramGadgets like electronic toys and musical players commonly use 1.2V rechargeable batteries in capacities ranging from 200mAh to 2800mAh, which need to be charged and maintained regularly. Here we present a simple and low-cost device that can charge or discharge up to four 1.2V rechargeable batteries simultaneously with maximum current of around 100mA per battery. […]

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