Lincoln Ultrashade helmet issues

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I have a Lincoln Ultrashade Silver Series auto darkening helmet, and it seems to have stopped "darkening" when I weld.  Its been hanging up quite a while in a semi dark room, so I am curious if maybe the internal batteries have completely died.  I don't know much about these hoods, but I do know the cheap HF auto hood that hangs directly beside it still works without any issues.  Any ideas?
Reply:It's a lot easier for you to check the batteries than for me to do it here, and that seems like a reasonable first step. I don't have any idea what type of batteries it has, how to get to them, or if they are rechargeable and charged by a solar cell...but would think that looking at the helmet would answer some of those questions. I also suppose that someone else reading your post eventually will know all about your model, but do you want to wait for that?[Not really trying to give you a hard time but am offering a friendly suggestion that you do the basics or tell why you can't, before asking.]
Reply:I pulled the entire assembly out of the hood, and I really can't find any easy way to access the batteries.  I guess its entirely possible they need to be charged, so I left it out in the sun for a little while (until it started raining).  Its just funny that the Harbor Freight hood, which cost about a third of the Lincoln, still works fine.
Reply:Some of the hoods use lithium batteries,they have a shelf life of at least 3 years.If the hood sat around for a while after manufacture,could it be that old ?The HarborFreight helmets just have 4 press pins and a bit of glue along the LCD edge holding them together. Attached Images
Reply:I'm not sure how long it sat around before I picked it up, but I have used it before without any problems.  In fact, its replaced my HF unit as its a little more comfortable.  Well, it had replaced the HF until it stopped working!  I just picked up a Hobart hood that takes AAA batteries, so I'm going to give it a try.  Guess you can never have too many welders or welding hoods!
Reply:Originally Posted by Jason280I pulled the entire assembly out of the hood, and I really can't find any easy way to access the batteries.  I guess its entirely possible they need to be charged, so I left it out in the sun for a little while (until it started raining).  Its just funny that the Harbor Freight hood, which cost about a third of the Lincoln, still works fine.