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Quick update:
I swapped the capacitor back into my axim :(
Unfortunately when in circuit, the cap discharges rapidly to about 0.9v (after being charged by the main battery). I was unable to remove and re-fit the battery before the clock lost date and time.
It looks like either the cap has dramatically lost capacity, or the clock circuit is presenting a greater than normal load to the back-up supply. Either way, replacing the capacitor with a rechargeable lithium cell seems to solve the problem.
I have re-fitted the Varta cell into my axim.
I'll try to work out a way of measuring the capacity of the original device, as I'd like to know what is the cause of the problem.
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Bill
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