Does the charger kill the battery

Hello and welcome to the forum, it could be a number of things causing your battery drain. Is the charger a new one? Or one that you've had for a while?
 
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Welcome to Android Central! Use the Diagnostics in the Samsung Members app to check the Battery Health. If it's not determined to be "Good", it may just be deteriorating with usage.

Another way to test battery health is with the app AccuBattery.