Not really a matter of efficiency - the company I work for does power beaming - the problems involved are safety concerns more than anything else. You don't want to get between the transmitter and receiver - the power transfer uses microwaves, you'd effectively cook yourself. For home units there would be too much liability.Originally posted by Over Achiever
Battery power? Well that remains to be seen if power can be transmitted efficiently over short distances. Hopefully this technology will be made feasable soon.