[Shop-talk] Welding auto-darkening helmet

[Jeff Scarbrough]

On Mon, Sep 24, 2012 at 4:31 PM, Jeff Scarbrough <fishplate at gmail.com> wrote:
> On Mon, Sep 24, 2012 at 4:06 PM, PJ McGarvey <pj_mcgarvey at hotmail.com> wrote:
>> So I just want to be safe here, is there anything I can/should do to test this
>> out so I know it will work when I spark up the welder?
>
> Mine will darken when pointed at the sun...

Having said that, there may be some tiny batteries somewhere...  Page
7 of this document
http://manuals.harborfreight.com/manuals/46000-46999/46092.pdf states
that my helmet has 3V lithium cells for backup, that typically last 6
years and don't need to be changed.