Don't know how long I have owned my auto darkening helmet...but it had me going crazy today. Started tig welding and noticed that the arc was brighter than usual and that I couldn't see my puddles. Since I have a history of vision problems thought it was on my end and started turning the buttons on the helmet...no change.
Took it apart - assumed it had dead batteries and looked for a battery cover..NONE
Had to use a knife to separate (break open) the module covers...sure enough inside were (2) 2032 coin batteries, replaced them and used super glue to put it back together....work fine. Looking at how the batteries were installed...I don't think the manufacturer wanted the batteries replaced...