I also can easily manage 3-5 days with my FP1 without charging, just sending maybe 10-20 SMS + 30-60min talking + 1h surfing…so not so much usage, but normal for me!
I am satisfied with the battery duration for sure!
For clearity I recommend to use the advanced app “BetterBatteryStats” which you can find in the XDA-Forums as apk. Here you can also find possible troubles with “wage locks” which keeps your CPU/GPU running although in Standby.
0.4-1% per hour should be normal in Standby (and not 50% in one night!!) - at least for my first Batch FP1.
Furthermore I underclocked my CPU with “SetCPU” to only 754MHz, which is quite enough for daily use!
Cheers, Robert