> As a battery, this is not useful. I disagree. The article also states that a brick can be fully charged in 15 seconds. If we go by your back-of-the-napkin ma

> As a battery, this is not useful. I disagree. The article also states that a brick can be fully charged in 15 seconds. If we go by your back-of-the-napkin math, this would mean the equivalent of a lead-acid battery would take a couple of minutes to fully charge. Meanwhile, a lead-acid battery takes 12-16 hours to charge. Depending on how these bricks handle load cycles, this technology seems absolutely brilliant for applications that involve energy storage/load balancing from renewable energy sources.