SINGAPORE - Charging your smartwatch or medical implant wirelessly in the future could be as simple as being near a Wi-Fi router, after a recent breakthrough. A team of researchers from Singapore and Japan has found a way to use very tiny devices to convert Wi-Fi signals into electricity to power small lights called LEDs. The research, published last week in the prestigious Nature Communications scientific journal, could eventually help wirelessly power wearable medical devices and consumer electronic items. This is possible as long as they are within range of Wi-Fi signals, which can be up to 100m. For medical implants, the technology could do away with undergoing surgery every time an implant's battery needs to be replaced.