https://www.amazon.com/gp/product…=UTF8
NOTE: While they last much longer than using a rechargeable AA in a "C" sleeve, they are longer than standard alkaline cells and may not fit in some applications. I measured the size with calipers at 50.77mm. For comparison, I measured an alkaline Duracell at 49.55mm. That could add up if 3 are back-to-back and it’s a tight fit to begin with. They charge fine in my Nitecore D4 charger but I can only fit 2 at a time in alternating slots.
This is the lowest selling price and probably lower than buying 6 AA Eneloops and C sleeves.