With physical reverse polarity protection in place, there is no way for my stock LS 21700 to make contact with the positive connector. A quick workaround will be adding a solder bold to the cell, but not everyone have the necessary tools for such heck.
Probably depends on how much the surrounding wrapping gives in.
Also, they machined the aluminum spacer the wrong way around in the 18650-21700 adapter. It has an indent instead of a button at the end.
The plastic tube is threaded and the piece can be removed which does help as long as the button in the battery is tall enough. But then the adapter just flops around freely unless there’s a battery pushing it down.
They also need ease up on the aggressive stepdown. Whether cooled or not, on a 30T turbo steps down (from 1950 to 1080 lumens) after 1.5 minutes while the surface temperature doesn’t even reach 40°C. They clearly have a temperature sensor so why not use that?
After the light has initially stepped down, subsequent turbo activations result in about 5-20 sec of turbo depending on temperature (in room temp when not turning the light off to cool in between). If the surface temperature is above ~46°C, turbo is not available at all. This seems like a good safety measure, but the limit could possibly be raised a bit. On high, the light never heated up to an unholdable level.
On very low battery voltage, turbo works only for a second or two, but maximum level can be achieved with mostly depleted batteries.
With those improvements made, I will probably buy a few of them, some for my friends. For item 3, I thought there is a formula for reflector geometry to optimize the beam. I didn’t know they just arbitrarily shape the reflector.
Also timed step-down are for cheap low quality flashlights. Really hope Astrolux gets rid of it if it already has a temperature sensor.
Also hopefully it can supported Acebeam 21700 protected.
The FT02 can maintain regulated ~1000 lumens without stepping down for the whole runtime (~1 hour on a 3000mAh 30T) with an average efficacy of ~95 lumens/watt, which is about the same as the Zebralight SC600w HI at its 600 lumen level.