TDK, a Japanese electronic parts maker, has unveiled a groundbreaking material for solid-state batteries that could revolutionize wearable technology. With an energy density of 1,000 Wh/l, it is estimated to be 100 times more efficient than TDK's current solid-state batteries. This breakthrough could greatly enhance the performance of wearable devices like smartwatches. Solid-state batteries are highly anticipated for their ability to store more energy and charge at a faster rate than traditional lithium-ion batteries. TDK's innovation is set to be utilized in various devices that are in direct contact with the human body, such as wireless earphones, hearing aids, and, notably, smartwatches. The batteries will be made with an all-ceramic material, featuring oxide-based solid electrolyte and lithium alloy anodes. This development marks a significant leap forward in the world of wearable technology.