I have a Hobart auto darkening hood and I guess I need to replace the battery on it. It works intermittently and it's killing my eyes. Anyone know how to crack them open to replace the battery? seems like it's sealed shut. This is the hood I have. http://www.millerwelds.com/products/weldinghelmets/images/big_XLi-Black.jpg And in case the mods think this isn't 4x tech, I need the hood to work on my new frame.