transmitting electromagnetic signals over the air has been done long time ago (think fm radio), but to charge a battery you need much more power, to a level tha

transmitting electromagnetic signals over the air has been done long time ago (think fm radio), but to charge a battery you need much more power, to a level that becomes unsafe foe humans to be around it. there is no mention in the article about saftety and what the long term effect will be on humans when constantly around it.