I'm afraid, that change from *nominal* 1200 mAh to *nominal* 1400 mAh may be not visible at all, from user's POV, except placebo effect. The only way for *real* boost of uptime, would be to do similar thing as dual-scud for N900. Interestingly, N950 would be still quite flat, despite double batt. The problem here, is that there is no source of pre-produced "fat" backcovers for N950 - not even one as ridiculously over-priced and under feature-complete, as Mugen cover. I'm planning to prep.are "something" for N950, when I'll finish body replacement project for N900 (see link in my signature). Who knows, maybe it will be even more than a simple backcover (it would be great to do something with terrible low wifi/cellular signal performance, at least when compared to N900's one). But it all have to wait until N900's gooddies come to life /Estel