Go to support, then to phone diagnostics, then look for battery.
Thanks for reaching out to us in order to find out about how to know your Samsung Galaxy A50 battery health. And EllisKai is right, you can run the Self-Diagnostic tools of Samsung Members app so you can know your device's battery status. I hope your are satisfied with the reply given by our dear Samsung member and your device's issue has been resolved.
Should you need further assistance and guidance, you may contact us via our online Samsung Customer Care support channels below.