Has anyone heard of a lithium cell or pack or something like that, which is essentially 2 AAA batteries side-by-side, such that it could be dropped into most devices which normally require 2 AAA batteries? Preferably with a built in USB port for charging but I’d still gladly take no USB and use a different charging method if that’s all that’s available. All I’ve been able to find is tiny pouch cells that are roughly the right size, but they don’t have right design, just wire leads.