DIY salt-water battery lighting up an LED

Bulb company:

Then why don’t they put up such small devices on light houses by the seasides, without bother connecting the cable lines to electricity grid?

Wow , Superb hack

This gives the issue some much-needed context

What will happen to it after hours of glowing? I mean it can't glow for ever.

Good job 👏

salt water and an LED, peak garage science