welding helmet replace battery

This weekend I spent some time in the shop building a heavy duty mobile base. My welding results were PITIFUL!!! I cleaned the surfaces very well, spark sounded fine, etc. Basically I couldn't see ANYTHING through my 20 year old HF auto darkening helmet! I used to be able to weld just fine...

My harbor freight welding helmet stopped darkening automatically unless the sun was bright. It was a real drag since the sun is setting earlier these days. If I didn't quit in time, I'd get to see some bright lights. No flash burn, but the bright flashes can cause headaches. There was a post...