When Cell Phones first came out, what determined the model cell phone that one would choose would be the battery life. Now, every cell phone lasts a long time, but they still need to be charged every few days, and even more often if one talks a lot on the phone. When charging a cell phone, it is best to leave it until it has finished charging instead of constantly unplugging it early. One should also make sure not to leave it to over charge. Any of these things could affect the battery.