It is true that Li-Ion batteries benefit from a full dis/rech...
I have the MH-C9000 (best AA/AAA smart charger on the planet) & one of it's routines for optimizing the battery (break-in mode).
Is a sequence of discharging & recharging....
It doesn't have a huge impact, but is beneficial for the LT condition of the battery.
Got to a forum like candlepower and all the battery nuts there will say the same.
However it could be that this won't apply to Li-Ion batteries in the N9, because of the controller chip & how it regulates charge.