I have a HTC tattoo in my property for around a half year. Never had any problems with the battery. Since 2 weeks the battery runs empty very fast. Even when I dont use WiFI (i never use another internet connection), don't call and even don't send any text massages. I installed a tas killer. Every time i used u programm I kill it afterwards. I also installed a juice plotter. In the schedule I can see that my batterylevel turns down even when the screan is asleep. Hope someone can help me out!!