non-universal
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The airpodsa2 charging case cannot charge airpods3 headphones. The airpods3 is a charging case, similar to a power bank, that can charge your headphones or charge them separately.
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Box separate charging method
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1, wired charging, AirPods generation two generation support wired charging. Use the Lighting cable that came with the AirPods to plug into the port of the charging case.
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2. Connect the other end to the charger or USB port.
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3, wireless charging, AirPods II has a version that supports unlimited charging, connect the power, and put the charging box on the wireless charger.