This publication describes systems and techniques for identifying transition points between charge tiers of a battery pack in a portable electronic device. Portable electronic devices, including smartphones, are often powered by rechargeable lithium-ion or lithium-ion polymer battery packs. Electronic devices charge a battery pack using a series of constant-current stages and constant-voltage stages. It is generally desirable to remain in a constant-current stage as long as possible, but identifying the optimal transition point from constant-current charging to constant-voltage charging usually requires specialized hardware components that increase the cost of the electronic device. This publication discloses charging systems and techniques to accurately determine the transition point between charging states without additional or specialized hardware. The disclosed systems and techniques also provide information about the state-of-health and impedance of a battery pack.
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Pelosi, AleX, "System for Identifying Optimal Transition Points Between Charge Tiers of a Battery Pack", Technical Disclosure Commons, (August 04, 2020)