Can I run 2 Pila batteries in the same tube that have different capacities; such as a 150s and a 168s? If so will it just run at the lower capacity? I do mean Pilas, not a Pila and an unprotected cell.
Why not? As long as your lamp or LED can take a max. of 8.4V There is the two cell syndrom, where one cell seems to take more of a load than the other anyway!