Small diameter high discharge batteries

I’m trying to design an NPXL Ahsoka (live-action version) sabers, and I find that I just can’t fit a 18650 battery. I was thinking of a pair of 14500 but I haven’t found anything with significant discharge rate. 14500 are about 1.6A. I’ve found that the KeepPower 16650 can do about 4A each, so in parallel I should have about 8A. Considering that blade color is white, I’m not sure that will be enough for the saber, and I don’t know if I can fit two batteries in the shoto. Any pointers where to get high discharge 14500 or other possible solutions?

These maybe?


I don’t know anything about these batteries in particular, but I’ve bought good batteries from liion wholesale before.