Looks like XTAR just got some competition, and with a reported 3600mW capacity: https://www.notebookcheck.net/Nitecore-launches-rechargeable-AA-batteries-with-1-5-volts-3-6-Wh-and-USB-C-connectivity.939621.0.html; interestingly, they don’t need any special chargers since they have a built-in USB-C port for that.
Hah, let’s see…
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They have a “Reviewer invitation” on their product page: NH2400 (click on the “Reviews” tab and then on the “I’m qualified” button), and when you get them (they’d be fools not to send you a couple) please let us know what you think…