I have three computers. On my oldest machine, i had this issue.
It lost time completely, i.e. the date was 2006 sth. hour/00:00
okay, i changed the battery. nada.
i bought a pack. tried three batteries. nothing. maybe i wrecked the contact, maybe not.
while this is really annoying on a computer (firefox wont open any pages with the wrong date that way back) ...
and a pain in the a... to change it after each booting
i can surely live with it on my kemper as it is only a few minutes in 4 years, imagine you change the battery and have the same problem as me
on my old pc or even things worse could happen, so lets live with it and find swiss specialists for the KPA MK2