The helmet should have a battery in it and the solar panel extends the life of the battery.
At $70 it would be considered a cheap auto darkening helmet. I paid $250 for my Migomag helmet about four years ago and only replaced the battery once in that time, it's never failed to work and I weld nearly every day.
At the top of the scale are Speedglas helmets, this one is AU$565 Speedglas
Cheers, Murray


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