I have a Mazak QT 200 and I am getting a battery malfunction alarm after I have replaced batteries and checked parameters are in but I am still getting #8 battery malfunction alarm have checked batteries with a tester
96 QT30 T-plus here. Ours would throw the #8 battery alarm and it would always be the C/D cell looking battery on the memory unit below the axis drives. The batteries would measure fine out of the machine with a multi meter and no load, but when in the machine with a load they would read faulty instead of reading at or slightly above rated voltage. We went with a replacement battery with a little more capacity (same voltage of course)and we still end up replacing it once or twice a year.