Why does the battery for android phones perform much better after 2 or 3 weeks of usage? Is there any logical reason?
I'll agree with Al Everett and say that the amount of playing with the new toy is certainly a factor early on.
I also did not notice any intrinsic changes in the systems battery management over time. I did however notice a massive increase in battery life by turning off auto-sync, and even mobile on occasion. With those two on, I'd see a significant drop in battery when I slept overnight, but it doesn't budge with those two off.
I use two power control widgets, the HTC data dashboard and the Android power control widget. Between the two, it's a piece of cake to tweak power settings to make sure I get the most out of the battery.
It does not. If you don't change any settings, Android will always do power management the same way. Installing and removing apps can affect battery life since running processes may eat battery while your acreen is locked, and the like.
Actually battery life can change and according to this post from HTC it can even be improved by the steps outlined in the post.