Here's what Apple says to do if your 2019 MacBook Pro is randomly shutting down
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Amazon.com: BatPower A1964 Replacement Laptop Battery for Mid 2018 2019 Apple MacBook Pro 13-inch A1989 EMC 3214 EMC 3358 BTO/CTO Battery MacBook Pro 13" Touch Bar A1989 Apple A1964 Battery 58Wh : Electronics