Nigel
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Those are more like lipo batteries than supercaps, you can't run them to empty without damage and table 3 says you have to charge them slower than the 0803 lipo charging circuit will and the maximum discharge current is not nearly enough to power an 0803...Well it looks like the possibilities for a Capacitor version might change..... I just received my most recent parts order (I work in electronics) and got my hands on a 15F 5.6V cap that is amazingly small.
Its the Vishay P/N: MAL219691214E3 capacitor and it's only 0.472" Dia x 0.394" L. Looking at the datasheet it seems like they have many varieties which might be able to be squeezed in the case and provide 15F+.
I plan on mounting this 15F unit in my 0803 and test it out. Stay tuned!