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Leaving a 2020 MacBook Air—or any device with a lithium-ion battery—uncharged for an extended time can harm its battery health and potentially cause permanent failure. This is primarily due to risks like deep discharge, where a battery’s voltage drops too low to recover, and ongoing self-discharge that slowly depletes power even when unused. Over time, chemical degradation also reduces battery capacity, especially if the device is left uncharged. To preserve battery health during long-term stora