For kicks, I tested how long my non-cree SureFire L1 would run on a battery that's about 1 year old and has a few minutes of runtime already on it.
Low: 162+ hours
High: 91 minutes.
All of the above is on one battery.
However, the 162+ hour time was spread out over several days:
Low
9 hours on
13 hour 38 off
13 hours 38 min on
2 min off
23 hours 59 minutes on
1 min off
13 hours on
5 seconds off
9 hours 40 min on
7 hours 24 min off
18 hours on
2 hour 50 min off
17 hours 5 minutes on
9 hours 3 min off
39 hours 50 min on
5 hours 26 min off
19 hours 3 min on
6 hours 23 min off
34 minutes on
<5 seconds off
High
91 minutes on
Then my L1 shut off.
Towards the end of each mode, the light did dim, but it was still usable.
When I bought this L1, SureFire did not tell me I'd get this kind of runtime with a used battery.
Low: 162+ hours
High: 91 minutes.
All of the above is on one battery.
However, the 162+ hour time was spread out over several days:
Low
9 hours on
13 hour 38 off
13 hours 38 min on
2 min off
23 hours 59 minutes on
1 min off
13 hours on
5 seconds off
9 hours 40 min on
7 hours 24 min off
18 hours on
2 hour 50 min off
17 hours 5 minutes on
9 hours 3 min off
39 hours 50 min on
5 hours 26 min off
19 hours 3 min on
6 hours 23 min off
34 minutes on
<5 seconds off
High
91 minutes on
Then my L1 shut off.
Towards the end of each mode, the light did dim, but it was still usable.
When I bought this L1, SureFire did not tell me I'd get this kind of runtime with a used battery.