Spreeblick

I bought K700i one week ago in Vodafone UK. It`s great, has everything I need. There is only one problem, the battery life is very differ from what I expected. For the first time I charged it all night and next day battery went flat after about 12 hrs! of course I was using it a lot this day checking all the handset functions. The next day was same(it`s so difficult to resist the temptation to play with new handset ;). So far the longest working time I achieved was about 36 hrs and during those days I was using: radio about 1.5 hr, 0.5 an hr calling time, and gprs for 0.5 an hr. Irda and bluetooth are off and couldnt affect. I am not sure if it is normal or my phone/battery is faulty. I forgot to mention that battery in my mobile is Li-Polymer 700mAh (bst-35). Thanks in advance for any help.