Li-ion Battery Reliability - A Case Study of the Apple iPhone®

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Abstract

Li-ion battery reliability has attracted significant research attention, but few studies have incorporated in-service performance and reliability data of batteries installed within a product. This paper investigates battery drain, unexpected shutdowns, and slow performance associated with Li-ion batteries, with a focus on Apple iPhones® as a case study. The actions taken by Apple in response to these performance issues are discussed, especially from the perspective of Li-ion battery degradation. It is shown that not all battery reliability issues can be attributed to normal battery degradation; battery manufacturing defects and high C-rate applications are also shown to be contributors to battery reliability and performance issues, including those causing a low state of charge, a low state of health, and unexpected shutdowns.

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Sun, Y., Kong, L., Abbas Khan, H., & Pecht, M. G. (2019). Li-ion Battery Reliability - A Case Study of the Apple iPhone®. IEEE Access, 7, 71131–71141. https://doi.org/10.1109/ACCESS.2019.2918401

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