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This invention presents a method for efficiently charging small electronics from larger devices such as a cell phone. The technology requires a transmission chip to be inserted into the larger device, as well as a receiver chip to be inserted into the small device. Once the devices are within each other’s proximity, the chips automatically detect each other’s presence and initiate the charging routine. A resonant rectifier design enables receiver-side energy management, and allows automatic optimization of the energy transmission based upon the particular battery parameters and charge state of the small device’s battery. This system continues to optimize the transmission flow rate as the small device’s battery charges. Once fully charged, the larger device automatically ends energy transmission saving energy and allowing for more recharging cycles.