Home Green Accessories Guide Is it true that cell phone batteries generally have a shorter charge over time?

Is it true that cell phone batteries generally have a shorter charge over time?

I have noticed that my cell phones batteries tend to last for lesser time as I have owned them for longer period of time. I have also noticed that it generally tends to decline after a year or so. I am now curious to know that is this the similar trend for each and every cell phones batteries? I want to get answers from you people. Do cell phones batteries generally have a shorter charge over time? I would really appreciate your feedback regarding this. Thanks.