...You have something wrong with your phone, I hate when other people come in to a particular phone model subforum and say "your problem is bad you should bring your phone back"
I have the X2 my phone still has 78% charge on it right now, Just got home from a 12 hour shift at work where I used it quite a bit all day without charging it once, and it was off the charger for almost 2 hours before I left for work. Oh yeah stock battery.
We need to know ALOT more info then just your battery died fast... What software are you running, are you running a rom, what is your signal doing, wifi, bluetooth, all the transmitters/reicievers... what are you using and doing on the phone.