Hello Webley,
I believe it is true that the cells are at 3.33 volts. I do not believe you will have anywhere near the same capacity as a new cell.
With new cells available in the $1.00 to $1.25 range, it is hard to get excited about purchasing used cells.
These may work in a very low power application, but I don't think they will do well in flashlights at all.
Tom