How do I replace the dry cell battery in my Geller AX 100?

Thanks Rupert, the batteries were exactly where you said. As for the Mac, I guess I'll just have to borrow a laptop of some sort!
Thanks again:)

Ed Cook
April 2020

After looking at a technical service manual for an AX100, it's not totally clear if this has changed over the various different versions over the years, but there appears to be a battery access flap on the front edge of the till, just under the keypad. The batteries appear to be mounted in a holder that pulls out of this access flap.
Sorry, I'm unable to find any advice on Mac connectivity.
If the battery suggestion is correct or not, reply to this thread by using the 'add an answer' button which will help future users needing the same advice.

Rupert
April 2020