All products featured on WIRED are independently selected by our editors. However, we may receive compensation from retailers and/or from purchases of products through these links. Learn more. Historically, making a thin phone meant trading the usual battery for one that’s slimmer and less robust. And what good is a thin phone with poor battery life? Up-and-coming silicon-carbon battery technology may be the answer. The technology has been creeping into view. It has been in research for de...