Techniques to train a personal area network component may include obtaining a packet error rate from a personal area network component. The second body is slidably stacked with the first body. The controller then can calculate and obtain the variation rate of the oxygen concentration in a unit time. The method increases the cycle life of a battery. Optionally, the container system may have an inner and outer wall element providing additional strength and rigidity and may also have a liquid container stored therein. The above annealing allows stress of the oxide film buried in the grooves to be relaxed.