French researchers have announced a prototype of an 18650 sodium-ion battery ... of these cells. The number might seem like a strange choice, but it maps to the cell size (18 mm in diameter ...

As announced at their Battery Day keynote ... in performance when shifting from 18650 cells to the larger 21700 design, but efforts to further increase cell size hit a brick wall.

Group1, a startup company in Texas (USA), has just announced the world's first potassium-ion battery (KiB) with the industry ...