Well, I’ve been using SF01 with lithium for a couple of days, and it’s going great. The low and medium modes hardly gain any light compared to the use of Ni-mh and alkalines, but the high mode is put into a stream of light of at least 250 lumens (being cautious, as the measurement is at “eye-calculator”; they will probably be more).
It goes very well with unprotected Efest, which measure the same as any AAA. And with the Trustfire 10440 in its various versions, all protected and longer, can work even if they do not fit well, simply taking care to thread the body to the top with the head (anodized thread) and leave the tailcap slightly unscrewed against the body, as this last thread is in natural aluminum and does not lose the closure of the circuit even if we unscrew a little.