in this thread (still relevant discussion?) there was much talking about ITP A3 runtimes vs. E01 runtimes. personally i can only measure ITP A3 XP-G R5 because that's what i have, and i dont have any E01 sorry:
ITP A3 XP-G R5 detailed and repeated runtime tests (10440 and Eneloop AAA; no Alkaline!)
for the E01 many inet reviewers (e.g. mev) report 7.0hrs on Eneloop AAA before the output vanishes to 0.5% of original brightness (lol) called moonlight mode.
I dont have the Olight i3 .. but its advertised runtime on Low (which battery used??) is close to what i clocked with Eneloop in the ITP A3.