Thankyou mouser69. I tried but no luck. I have asked the manufacturer's rep and this is their reply below so I shall have send it to them.
Regards,
Peter
CADD Prizm is not meant to be repaired by our customers even replace the lithium batteries inside. If the batteries are removed without attaching a jumper jig that we have here in the service centre, the pump can lose its program. As we don’t sell spare parts for CADD’s, I would recommend that this Prizm be returned to us so we can replace with the proper batteries and re-program the pump.