If your having trouble with this type of battery here is the problem. You've probably got this battery that was made by Korea. Those are horrible, heats up too fast and will not last.You want to make sure it was made in Japan. If not, send it back and get either the 'made in Japan' one or get your money back.My first one could hold a charge. Heated up and will not hold energy.So, I got my 'Japan' one from an old phone that I totally forgot in my car for a year. Beyond not being used and the heat the in car(Southern California), this battery still work and worked well.GET the 'made in JAPAN' version.Don't know if you have a defective one, do the battery test.Take it out of the cellphone, put it on a smooth flat surface and then spin it. If it continuously spin, it's defective. The defective one heated up and caused it to plump.If it spins for a very short time, it's good.