Battery
MacBook Air operates normally when connected to power, but shuts down after several seconds when power cord removed
MacBook Air 13″, macOS 11.4
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Reset SMC: How to reset the SMC of your Mac - Apple Support Choose the appropriate method.
Quote:
Resetting the system management controller (SMC) can resolve certain issues related to power, battery, fans, and other features.
Is Battery condition stated as Normal?