French researchers have announced a prototype of an 18650 sodium-ion battery ... 2,000 recharge cycle life span. By comparison, a typical lithium-ion battery has around 110 Wh/kg and tops out ...

In these circles, many elect to create their own battery solution, relying on the popular 18650 cell as the basis for the pack. These can be readily harvested from laptops, power drills and other ...