When you say “do not fit” — you mean electrically, the light won’t light up?
(as I have tried five or six different protected cells that physically fit into the light, the tailcap screws down fine — but the light won’t light up)
If it’s electrical fitness — Krono is keeping a list of cells that work in the (increasingly long and detailed) OP at GB BLF LuckySun D80-SE Need long tubes? -3/3/16