iPhone Battery Better After Restarting?

[MacGiver]

iPhone geeks colleagues,
Since recently I noticed my battery was discharging faster than it used to (my 3GS is about 3 months old)...I also noticed that restarting my iPhone would increase my battery level..for instance yesterday i was at 17%, i restarted and i was then at 30%. This morning after full charge all night on the mains when i unplugged the iPhone i was at 99% when usually i was at 100% and this for a little while....but here from 99% it went down to 97% very fast (30sec). I restarted and i am now at 100%.
Does anyone experienced this? Any idea why this is happening?
Thanks
X

 

[hamzab]

Yup, I notice this as well, sometimes I put it lock at around 82% and when I unlock it after a few mins it jumps up to 84%!

I think it's the software, I've been on the phone to AppleCare and they are saying Apple is releasing a new update soon, I think maybe this Wednesday.

I also downloaded that free BatteryApp program from the App store, It displays a different battery percentage then the OS does?