I have had similar issues with my Nexus 410 and 200B. There are batteries that support the tool mag. I was told by Mazak service they are only good for about 1- 1-1/2 years. We go to a local BatteriesPlus and take them the battery, they unsolder the wire and connector and re-solder onto a new battery, cheaper than Mazak. On mine we always replace them in pairs. When I get to my shop, I will see if I can take a picture of where it is located and post on here. Seems like they are on the tool mag drive in the control cabinet behind a little "flip down cover".