All charged up — Apple supplier says new tech has 100 times the capacity of its current batteries. Enlarge / TDK says its new ceramic materials for batteries will improve the performance of small consumer electronics devices such as smartwatches and wireless headphones Japan’s TDK is claiming a breakthrough in materials used in its small solid-state batteries, with the Apple supplier predicting significant performance increases for devices from wireless headphones to smartwatches. The new mat...