I'm sorry to hear you're experiencing problems with your battery. The first thing I suggest you try is to wipe the cache partition. This wipes temporarily stored data and allows the device to operate much more smoothly. To do this:
After all of this give it some time and try using the device as normal. If you're still experiencing these draining issues then I recommend you get in touch with an authorized Samsung Care location. One of these Samsung Care locations could run a diagnostic on the phone and test for drainage, etc. I also recommend you use an official Samsung charger as recommended for your device as well. Third-party chargers are capable of damaging your device.
For Samsung Care Authorized locations near you:
To contact Samsung directly for further troubleshooting and escalations: 1-800-SAMSUNG
Be sure to click " ✓ Accept as Solution" when you find an answer that works for you.