I bought 2 of these batteries, each from a different seller. These 2 plus the one that originally came with the phone made 3 which I rotated so that I'd get equal use from the 3. The 2 batteries worked great at first, but after 2 months, one of them would not take charge. At first I thought it was the charger, but when I proved that the other batteries took charges, I was 100% sure it was the battery. Given that I wasn't using my phone much during the 2 months, and that I was rotating among the 3 batteries and that I get 3 days use before I get a low-bat signal, I would say that I used this battery in question a total of 12 days. One reviewer says it has a one year shelf life and if one is lucky to buy a fresh one, then one might get a full year use out of it. I looked at the battery with a magnifier to see if there is any information of the date the item was manufactured, and I could not find any. So, short of going to a T-Mobile or a Cingular store, how does one get a fresh one from Amazon?