[time-nuts] Ultra low power RTC

[Mark Sims]

Probably 20+ years for a lithium coin cell... basically the shelf life of the cell.  I have a card of 24 year old CR-2032's that are still above 3V, and no sign of leakage.

BTW, never handle a coin cell (particularly in watch applications) with your fingers... your grubby fingerprints are rather conductive and can discharge a cell surprisingly quickly.   

Also note the clock chip has 512 bytes of RAM in it.

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> Assuming you are going to run it off a battery. What’s the self discharge
rate on a reasonable battery?