First, consider the basic reason that any Lithium-Ion battery pack needs protection. Regardless of the application, it is desirable for the battery packs to operate safely under all possible conditions. Ideally, it is necessary to make sure that the battery performs up to its full rated capacity, and has the longest possible service life over multiple discharge and recharge cycles. Proper battery management circuitry is essential to maintain a robust, safe system that operates at peak performance.