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There's a new highest-capacity 14500 battery, but it falls a bit short of advertised.
(social.goodanser.com)
Portable illumination
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Are those still standard lithium-ion? I wonder if silicone-carbon batteries will make it to these types of battery cells (and 18650, and 21700... ). They're already being used in smartphones to give them greater capacity in the same (or smaller) form factor: https://www.tomsguide.com/news/forget-lithium-ion-worlds-first-silicon-carbon-battery-blows-that-tech-away
Those look to be Li-ion with a slight material change. They don't mention Wh/Kg so there's no way to know if it's actually better than the 21700 cells that are available.