Engineers find the latest details on optimizing charging circuits, developing battery gauges that provide the longest possible run-time while ensuring data protection, and utilizing safety circuits that provide multiple independent levels of protection for highly energetic batteries. This unique book features detailed design examples of whole systems, providing practitioners with the real-world perspective needed to put this knowledge into practice. Readers learn how to perfect their designs, helping to ensure the development of devices that will succeed in the fast-growing portable device marketplace.