Ok, so, after about 48 hours I plugged it back in ALTHOUGH it had 20% left, since i was expecting a call and didnt want it die in the middle of the call.
Before buying the phone, I was actually a little concerned after reading all those reviews, that it wouldnt last long, but hey it is indeed doable with some minor tweaking and light to moderate use.
p.s. i ordered a slim extended battery from seidio and bought chargers for home/car/work, just to be on the safe side