[porsche tech]

Our shop helmet would not self darken so I thought we needed a new lens. So then I took it up to the local welding supply place and he tested it and it worked. Then several more times it wouldn't darken and after another trip in the car it worked. We had been storing in on the bottom of the welding cart with the gloves and apron over top of it...no light getting to it. Finally figured it out it needs light to charge it up...even hanging a drop light in front of it will charge it up. Took me a good while to figure that one out.