my sony ericssion z550i battery getting hot while using it

i had the same problem with sony ericssion and now I'm using nokia

Hi Navneet, Heating up of batteries is a common problem with many phones but it looks like it is causing discomfort with this particular model. If I remember correctly, there was a huge battery replacement exercise done by the phone majors but I can't seem to remember which one. If you are travelling extensively and use the phone for long hours, then you might want to carry a spare battery with you. The common battery can be found at www.myshopping.com.au/GO--245930930_NEW_Original_Sony_Ericsson_BST_36_Battery_Pack_K310i_K510i_Z550i_at_peakhour_com_au and is not very expensive either. Do remember to remove the phone from the charger overnight as over-charging also results in over-heating of the battery and God forbid if it decides to break out in flames or something! Got you there....don't worry...I am just pulling your leg...that is something which is quite unlikely to happen.

my sony ericssion z550i modle getting hot within 3 to 4 minutes while using