Here are some diagrams for runtime for your reference.

CR123A*1 battery
Maximum output 190 lumens, for about 50 minutes (with brightness declines to 50%)
Minimum output 6 lumens, for about 42 hours (with brightness declines to 50%)

16340*1 battery
Maximum output 190 lumens, for about 35 minutes (with brightness declines to 50%)
Minimum output 6 lumens, for about 33 hours (with brightness declines to 50%)