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Iriver H10! Help me please!

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TheDrive:
I should clear this theme since it wasn't cleared 5 years ago.

In iRiver H10 its not a backup battery - it's ELNA 3.3v 0.22F Coin Cell Capacitor.
So it's not a "model", but just voltage and capacity "printed" on the coin
3.3 Volts and 0.22 Farad (which is the same as 220000 MicroFarad or uF)
Coin has steel terminals that are welded to coin and soldered to the board.
Part numbel seems to be ELNA DCK-3R3D224
Dataheet you can get here:
http://www.mouser.com/ds/2/129/DC_DCKe-4234.pdf
It seems to be that this part has been discontinued by the Supplier with No Replacement at this time.
You can look for analog with suitable specs.
I don't think you could find such a part in jewelery. More probably you could order it in radio shop.

Part is of type of Electrical Double Layer Capacitors (ELDC) aka Ionistor, which have relative high capacity.
You can read theory in Wikipedia:
http://en.wikipedia.org/wiki/Electric_double-layer_capacitor

BTW:
Manufacturer stated in datasheet that: "Unlike batteries, unlimited charge/discharge cycles; ideal for solar watches, solar calculators, solar remote control units, camaras and the like."
However our capacitors "look corroded" after a few years. As I realised, this "corrosion" is just dried up elctrolyte leaked from the capacitors due to overvoltage or most probably normal wear. For compare I have button sized Lithium accu in my watches (almost the same as RTC backup) which declared to work over 10 years (it works already over 5 years and still be OK... for a while :)).

If you can't find rare suitable ELDC you can replace it with 3V lithium button cell, but with DIODE(!!!) to avoid battery chagring by device!

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