Hi,
my HP-41C (I obtained recently) has been not used in the last three weeks. When I turned on yesterday it losts his memory. Battery are ok, and the calculator seems to work fine (apart from the usual problem to stay ON only for two-three minutes before an auto shutoff).
Why did it lost his memory?
Can this due to the fact that I put the HP-41C in a TI-65 case (I'm joking of course, but maybe ...)?