This weekend, the battery in Galaxy 4 began having issues. First, I noticed that phone felt hot in my purse one evening. I didnt think too much about it, and put it on the charger when I went to bed. The following morning, it had only charged to 53%. I changed outlets and began to recharge. The most it got to was 84% after several hours. The whole day, the phone kept losing battery and would not charge at all. I called Tmobile as this phone is less than two months old. They wanted to do a Master Reset, but since the phone is so new and just set up the way I like it, I insisted they replace the battery instead, which they finally agreed to do. I havent gotten the new battery yet, but should have it tomorrow. The phone is completely dead now. Thinking back, I hope the heat I felt from the phone was just contained in the battery and not harmful to the handset itself. I am worried and had to pay full retail cost for this phone. I will keep you posted. Anyone else have battery issues??