79volvo Said:
"MacBook Air 2017 shuts down when on battery but battery is charged: Why does my MacBook Air 2017 shut down when on battery after a few minutes? Battery is fully charged, Battery cycle Count is only 277, but condition is: Service Recommended."
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It's time for a new battery. Nonetheless, read the following...
Troubleshooting Mac Charge:
Some Links that may Help...
A. Black Mac Screen:
Go Here: If your Mac doesn't Turn On or Start Up - Apple Support
Using External Devices: Try Resetting the SMC and NVRAM, but this time, using an external keyboard. Connect an external monitor and see if you get an output.
B. Mac Power Issues:
Try a New Charger:
If it is currently charging from a charger, then use a new charger:
C. A Few Links to Refer to Power: