Some members of the flashlight community were puzzled by the H18’s relatively short runtimes.
I tested H18/519a on the High level,
specked: 900-500lm, 2min+3h40min.
The runtimes until the low-voltage brightness drop:
- stock 6400mAh battery: 3h 57minutes
- Molicel P50B 5000mAh: 5h 19minutes
It means ~35% longer runtime despite ~22% lower battery capacity.
H18 needs a high discharge current battery and not a high capacity battery to shine strong and long. Stock battery cripples the performance of H18.
Additional considerations:
- unprotected battery is too short and requires some spacer to avoid turn-offs when shaken
- H18 discharged the unprotected battery to 2.88V. Such low discharge state will require tickle/precharging before entering the constant current charging phase, to avoid accelerated deterioration. I did not test H18 for that.
https://i.redd.it/0vw9vy5ckboh1.jpeg
Source: r/flashlight · by /u/macomako