Hello Dave,
Farnell UK have these;
http://uk.farnell.com/w/c/batteries-chargers/batteries-non-rechargeable?battery-size-code=2-3aa
Best Regards,
Laurence Motteram
Calibration & Service Manager
Scientific Devices Australia
Ph: +61 (0)3 9569 1366
M: +61 (0)425 765 019
Last year I went down to Keysight for a course, and got a tour of their cal
labs. I spoke to the person showing us around about the 3457A battery. He
said if the battery was less than £35 or so, it could be replaced free of
charge when the instrument was calibrated.
So despite my 3457A's battery