Testing my Sodium-Ion light at -40°C. The flashlight outlasted the camera recording it. (9.5 Hours Time lapse)

So, this is a bit awkward (but also kind of perfect).

A lot of you asked for a full runtime test at -40°C to verify the sodium-ion discharge curve.
We set up the thermal chamber, turned the light on High/Medium mix, and set up a camera to record the "death" of the battery.

https://reddit.com/link/1phicbm/video/tcg9h8m2l06g1/player

https://youtu.be/uQV7u2votnQ?si=9tAdU104VIQ8CpjQ

The Result:
The video cuts out at the 9.5-hour mark.
Not because the flashlight died—it was still running.
But because the camera recording it gave up first. (Battery died or storage full, we are still investigating the corpse of the file).

It’s ironic: I built this flashlight because I was tired of my lithium gear failing in the cold… and the lithium-powered camera just proved my point perfectly. 😅

Specs for the nerds:

• Temp: -40°C constant.
• Cell: 10,000mAh Custom Sodium-Ion.
• Result: >9.5 Hours continuous output.