Model Forum / Radio Controlled / Air Models / August 2010

Hi,
I have a 10 years old jr x-388s transmitter. Few days ago it displays a
backup error when I switch it on. So I replaced the internal lithium
battery with a cr2032 lithium battery (almost the same that my
transmitter has inside).All OK, the transmitter switches on with out
any error message, but when  I switch on AFTER FOUR DAYS, I see again
the "backup error" message,  I switch off, then switch on with out
"backup error" but it has reset all memory entries. The transmitter
works fine but when I store it for a few days without using it, then
when I switch it on, it displays for one time the "backup error" and
when I switch it on again it works but with no model data stored in its
memory.
Can anyone tell me what happens ???

Thank you.