Calibrating battery

Hi!
Relative new user and general lurker of this community. I hope my question wont be too annoying.
I have calibrated my battery following the recommendation on http://support.apple.com/kb/HT1490
but I have had always some questions about some of the steps mentioned there:
+3. Disconnect the power adapter while the computer still on and start running the computer off battery power. You may use your computer during this time.+
But if I start the calibration for example at night, and I use my laptop on battery power for ~2 hours, should I shut it off or put it to sleep for the night and resume using it on the morning?
+4. At this point, save your work. Continue to use your computer; when the battery gets very low, the computer will automatically go to sleep.+
I have experienced that my computer warns me of low battery and then shuts off (the light is not intermittent like in sleep mode), is this normal?
+5. Turn off the computer or allow it to sleep for five hours or more.+
If as in my case the computer shuts down when its on 1% battery, should I let it "rest" the five hours before connecting the power adapter?
Also I have experienced twice that after using my computer on power suddenly a *"not charging"* message appears, even if the light is green. I disconnect my power adapter (60 second wait) and connect it back again and sometimes the battery has gone down a lot. I have done a SMC reset.
My battery information:
Charge Information:
Charge remaining (mAh): 5168
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 6642
Health Information:
Cycle count: 25
Condition: Normal
Battery Installed: Yes
Amperage (mA): 3286
Voltage (mV): 12474
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Current Power Source: Yes
Display Sleep Uses Dim: Yes
GPUSwitch: 2
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 2
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
GPUSwitch: 2
Reduce Brightness: Yes
Thank you!

Welcome to Apple Support Communities
3. Let it run down until it goes into 'emergency sleep' by itself - ideally do this late at night so you can then leave it overnight discharging more.
4. It will shut down by itself that's correct,
5. Leave it at least 5 hours, I tend toward 7 and generally do this overnight.

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