Where to Get .... " D " Cell Li-ion Rechargeable Batteries....?

Does anyone know where I can order some ” D ” cell Li-ion?
I know that I could make a step down tube and use 26650’s but the light was made for the “D” cell and I wanted to give that a try for longer run time. They need to be 3.6 or 3.7 volt .
A waiting any suggestions !

Thanks

http://kaidomain.com/product/details.S022114

they are known as 32650s

They are sold out on FT but from my limited research Feilong is the one to get.

https://www.fasttech.com/products/0/10002175/1156800-feilong-32650-37v-6000mah-rechargeable-li-ion-batt

They also make a LiFePO4 version, but keep in mind the lower voltage requirements.

I’m not sure what your requirements are.

https://www.fasttech.com/products/0/10002174/1156700-feilong-32650-32v-5000mah-rechargeable-lifepo4-bat

Cell size you need to search for is '32600', they aren't terribly common but they are out there. 32650 is slightly less rare but a little longer, can be used if you can gain some extra space but that depends on the design of the light.

Thank you for all of your help.
I have some from FT.

I purchase mine here US supplier.
Test results here.