Battery running out soon

[#1]

Hi,

I bought Xperia ray yesterday. I have reacharged it fully. But its running out soon. Mostly 1 point going down for a minute.

Its seems like it survive only  2 hrs... plzz... help.....

[#2]

Thanks for your help.... its now working fine.... but only problem is its withstanding for only some 15 hrs if we use phone extensively... I think its common in all android...phones....