Over the last several years, Apple has dramatically improved how it handles lithium-ion battery charging in iPhones, iPads, Macs, and Apple Watches. Across multiple system releases, the company moved from always charging to 100% to a more careful analysis of how much charge is needed based on your daily usage patterns. Lithium-ion batteries have a remarkable number of charge cycles. You can charge them fully, drain them, and charge them full again hundreds of times without seeing much degradation
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