In the industrial facility I work in we have many of the hazardous area emergency lights for exit lighting in our classified areas. I have replaced several of these boards and batteries in the last year many of them more than once. The issue is it seems like these boards only last like 6 months max and then I have a repeat problem they run about 3500$ a piece has anyone else experienced these problems with these lights and if so do they have a warranty. They are really a pain to replace so I would like to hear some feedback if anyone else has worked with them or good replacements please and thank you!