Two years ago at CES, I stopped (rare at CES) to grab a coffee at Starbucks. While sitting there, I noticed these funny rings littering the table top. I initially thought some tech startup hopeful left them behind, but signage soon told me they were ‘Duracell Power Rings’ you could plug into your phone and settle over the table, which would charge your phone wirelessly. Any phone! ‘Neat concept’, I thought. ‘I’d definitely grab one for $5 if I went to Starbucks more’. But for $50? Not a chance.