New battery is not calibrating

Recently i changed my Galaxy S7 battery, but the battery life after that wasn’t very good, and i installed AccuBattery and after like 3 days of normal use, i checked the app, and it said that the battery life is at 68%. At one point i left my battery to drain completly, but i realised that 1% was lasting an hour. And i was thinking that battery is not calibrated correctly. I tryied to calibrate it by discharging completly and charging it until 100% with the phone off. But that didn’t help. What can i do? Also i don’t have the charger that came in the box, but it’s a samsung non fast charger. If i change the charger the battery will calibrate succesfully?