Hello, first post on here. I bought a new-to-me Lagun 10" by 44" 3 axis mill, a Bridgeport type, with an Allen Bradley 8400 Control. I got the machine powered up, the drives have no power yet for some reason, but it showed a 'battery low' error at first start up. I have a lot of Fanuc experience, so I went looking for the battery, found them in the main computer enclosure. My question, is it like a Fanuc, you have to change the batteries with the control powered up? Any other tips about this control? Thanks.