We've got an FMC Computerized Wheel Balancer (model 4100, I think - I'm @ home now), and every morning when we turn it on, it needs recalibrated. Do these things have batteries in them like PCs do?
P.S. - I'm going to call 1-800-fmc-blah-blah tomorrow, but thought I'd check with people who won't try to sell me a new machine! 8^)