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| p.1 #11 · Internal clock battery for Nikon DSLRs |
I am not sure what is the actual charge life for Nikon's DSLR, but base on what I knew, a Super Cap can be the size of two LR43 stack up on top of each other and with a voltage of about 1.2 -1.25V (can't recall the discharge capacity at this moment but I think is very close to the button cells), and the clock oscillator only requires below a volt (~0.7-0.9V) and a drive current of just a few uA. So base on the charge holding capabilty of the Super Cap with very little internal discharge something similar to what the Sanyo eneloop cells are doing, they can hold their charge for quite sometime.
Remember we don't have to support the volatile memory anymore.