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This is the self discharge rate I came up with for a 6 pack of caps to fall from 14V to 12V. Obviously a fall from 14V to 10V would take twice as long.
FCell mA 2V change
310 .45 63.8h or 2.7 days
350 .3 108h or 4.5 days
650 1.5 40.1h or 1.7 days
1200 2.7 41.2h or 1.7 days
1500 3 46.3h or 1.9 days
2000 4.2 44h or 1.8 days
3000 5.2 53h or 2.2 days
3400 18 17.5h or 0.7 days
I calculated the number of hours or days based off of Maxwell's data for their capacitors. Of course in the footnote it says "After 72 hours at 25°C and rated voltage. Initial leakage current can be higher". So at first it'll discharge quicker. But after that, at lower than rated voltages the leakage current should be less.
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