Originally Posted by j Ballard
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This is a great report. Correction on the part removed. The part that you thought was a lithium battery is actually the Gold cap or super cap. The part is made by Matsushita and the part number is EECEN0F204RK. The capacitance is 0.2F. The spec I have calls it a Electric Double Layer Capacitor EN series. The lithium battery you used as a replacement should work fine. The electrical design is able to use either the super cap or a lithium battery that the x50 used.
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Ah yes, you're right! it's an RK Type. So, it IS a super capacitor after all !
(I'll edit the original piece to avoid future confusion)
As you say, the lithium cell should be happy enough (although it may be a little under-charged at 2.8v)
Incidentally, the trouble with the old one, seems to be excessive self discharge (it's flat from 3.3v in a few tens of seconds - unloaded) so, for some reason it's become leaky.
[stop press]
I've just given the thing a good wash in isopropanol and re-measured it; The self discharge seems to have stopped. So, it looks like contamination around the insulator is enough to bugger them up.
If I get the time, I'll re-fit it into the Axim and see if that's the problem.