Ever noticed that in the Star Trek universe, no one’s communicator runs out of charge? And Darth Vader never worried about whether he’d remembered to plug in his lightsaber overnight, nor does The Doctor ever dash back into the TARDIS to grab his sonic screwdriver charger. It just never happens.
Possibly we’re to understand that these devices have their own tiny power supplies, but more likely these devices have some other way to get their juice. And wouldn’t it be nice to dispense with the problem of recharging once and for all? In our own local space-time continuum, a number of companies labor to make wireless power possible using a host of technologies, but there are two strategies that show a lot of promise, one using lasers, another using magnetic resonance.