I constantly hear cellular users complain that the talk and standby times of their portable have deteriorated over time. In many cases, it's all of them.
Customers tend to be hard on their batteries.
Some of the slow or overnight chargers require more than eight hours of charging, but the customer often removes the battery before it is fully charged. Some portables feature timed charging circuits that do not monitor the battery status but terminate the charging process after a predetermined time limit, no matter what state of charge the battery was in before charging. Again, this slowly cooks the battery. Plain and simple, heat destroys battery life. Although most cellular users are too busy to worry about all that proper battery stuff, AdvanceTec conditioning chargers come to the rescue.