Battery Conditioning on the HP 910

I've been trying to make a conscious effort to 'condition' or calibrate my battery by running it down and then charging it. Tonight is the first time I felt bold enough to run it all the way down. I got to 5% and got a warning that the battery was very low. Then I got all the way to 0% and a popup came onscreen and said it was shutting down in 10 seconds.
Once it turned itself off, I plugged it into the charger then immediately tried to power it back on. However, my ipaq showed an odd screen of a huge battery with an exclamation point then turned itself back on. After a few minutes I was able to turn it on and it had 2%, and most importantly, it hadn't lost any data at all!