Question about Samsung Ep-Ta20

Clearly yes, but to such a small extent that you will probably not notice it with a new mobile phone in the first 2 years. Nevertheless, use a normal charger to save the battery a little and if you need to recharge it briefly at lunchtime or in the evening, today's fast chargers are great.

Also, consider buying a charger with Quick Charge 3, which is backwards compatible and Quick Charge is becoming more and more widespread.

No.