Yesterday, I was building new dual battery from 2 scud bluedream cells, as my 1st dual-scud was getting really worn (~2100 mAh reported, as opposed to original 3100+ mAh). I've made it usking cells, that dr_frost_dk sold me looong time ago - time goes fast so I'm not sure about exact date, but surely, it was more than a year ago.

I've kept that cells between 20%-80% charge - to be precise, from times to times, I've charged them to 4.200 mV (without saturation phase, aso as soon as it hits 4.200 mV with 500 mA charging, I stopped charging, to not stress battery - what I did on this phase is called "fast charging" in Li-Ion world), then, discharged them to 3.800 mV, and kept them this way in dark place, room temperature, for next few months. After that, I did same as above.

The result is, that finished battery report 3010 mAh when discharged to 3000 mV at constant 300 mA rate. It means, that during variable rate discharge (real-life N900 usage), relative capacity will be much higher, 3100 mAh at least, or even more (thumbs held).

Conclusion - those cells, when properly stored, virtually doesn't lose any capacity at all. While I suspect that they were quite fresh at time dr_frost_dk bought them, it's still nice, how well they keep capacity during storage.
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I've took many photos during assembly, and I'm preparing some nice things for (wanna-be) battery constructors - I think both absolute newbies, and experienced dual-batt creators may benefit from it much. Stay tuned for Estel's N900 workshop, issue 1

/Estel