Solid-state batteries, currently only found in small devices like hearing aids, pacemakers, and wearables, provide benefits in both power and safety. TDK Corporation in Japan, a component supplier to companies like Apple, says it’s increased its solid-state battery energy output at 1,000 watt-hours per liter, which is 100 times better than its previous battery. While this battery breakthrough will first arrive to wearables and other small devices, similar solid-state breakthroughs could also rev...