The Jackson Safety NexGen Replacement Batteries are a replacement part that can help extend the life and functionality of your Jackson Safety NexGen Variable ADF Welding Helmet. The NexGen helmets feature digital controls for variable shades 9 - 13, sensitivity and delay adjustments and four independent sensors positioned to reduce the possibility of blockage during your weld. These welding helmets are a popular choice for welders who are serious about their craft.