18650 IMR with built in Usb? D4 light.

Since the D4 has no charging acesss besides standard separate battery recharging I was thinking of looking into the 18650 from numerous manufacturers that have the built in usb on the battery. Does anybody know of there are any IMR 18650’s with built innusb that could power the D4? I assume any would work but I wouldnt get full output from the light?

They won’t fit. Max 67mm. Unprotected is the way to go.

charging a battery inside an air tight tube was never a good idea anyway