Battery Health issue

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Batteries - Service and Recycling - Apple*

*MacBook Owners

Your battery is designed to retain up to 80% of its original capacity at 1000 complete charge cycles. The one-year warranty includes replacement coverage for a defective battery. Apple offers a battery replacement service for all MacBook, MacBook Air, and MacBook Pro notebooks with built-in batteries.

You may want to contact Apple and have your MacBook Air checked out and discuss your options.

Genius Bar Reservation and Apple Support Options - Apple

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~Katana-San~

The battery health percentage on an iPhone does not directly correlate to a specific number of charge cycles, though it is normal for your battery health to decrease as you use it.

Your battery is designed to retain up to 80% of its original charge capacity at its maximum cycle count. For best performance, replace your battery when you reach its maximum cycle count.

For more information: Determine battery cycle count for Mac laptops - Apple Support